diff --git a/rhubarb/CMakeLists.txt b/rhubarb/CMakeLists.txt
index 0fef2b7..0c0fd8c 100644
--- a/rhubarb/CMakeLists.txt
+++ b/rhubarb/CMakeLists.txt
@@ -467,6 +467,8 @@ add_library(rhubarb-tools
 	src/tools/parallel.h
 	src/tools/platformTools.cpp
 	src/tools/platformTools.h
+	src/tools/progress.cpp
+	src/tools/progress.h
 	src/tools/ProgressBar.cpp
 	src/tools/ProgressBar.h
 	src/tools/stringTools.cpp
diff --git a/rhubarb/src/audio/processing.cpp b/rhubarb/src/audio/processing.cpp
index 39cc8db..316efd7 100644
--- a/rhubarb/src/audio/processing.cpp
+++ b/rhubarb/src/audio/processing.cpp
@@ -1,4 +1,5 @@
 #include "processing.h"
+#include <algorithm>
 
 using std::function;
 using std::vector;
diff --git a/rhubarb/src/audio/processing.h b/rhubarb/src/audio/processing.h
index 8ece651..dc09c56 100644
--- a/rhubarb/src/audio/processing.h
+++ b/rhubarb/src/audio/processing.h
@@ -3,7 +3,7 @@
 #include <vector>
 #include <functional>
 #include "AudioClip.h"
-#include "tools/ProgressBar.h"
+#include "tools/progress.h"
 
 void process16bitAudioClip(const AudioClip& audioClip, std::function<void(const std::vector<int16_t>&)> processBuffer, size_t bufferCapacity, ProgressSink& progressSink);
 void process16bitAudioClip(const AudioClip& audioClip, std::function<void(const std::vector<int16_t>&)> processBuffer, ProgressSink& progressSink);
diff --git a/rhubarb/src/audio/voiceActivityDetection.h b/rhubarb/src/audio/voiceActivityDetection.h
index 7820680..0e5bcb9 100644
--- a/rhubarb/src/audio/voiceActivityDetection.h
+++ b/rhubarb/src/audio/voiceActivityDetection.h
@@ -1,6 +1,6 @@
 #pragma once
 #include "AudioClip.h"
 #include "time/BoundedTimeline.h"
-#include "tools/ProgressBar.h"
+#include "tools/progress.h"
 
 JoiningBoundedTimeline<void> detectVoiceActivity(const AudioClip& audioClip, int maxThreadCount, ProgressSink& progressSink);
diff --git a/rhubarb/src/lib/rhubarbLib.h b/rhubarb/src/lib/rhubarbLib.h
index ca40a06..ae841a6 100644
--- a/rhubarb/src/lib/rhubarbLib.h
+++ b/rhubarb/src/lib/rhubarbLib.h
@@ -3,7 +3,7 @@
 #include "core/Shape.h"
 #include "time/ContinuousTimeline.h"
 #include "audio/AudioClip.h"
-#include "tools/ProgressBar.h"
+#include "tools/progress.h"
 #include <boost/filesystem.hpp>
 #include "animation/targetShapeSet.h"
 #include "recognition/Recognizer.h"
diff --git a/rhubarb/src/recognition/Recognizer.h b/rhubarb/src/recognition/Recognizer.h
index 05c445d..0903680 100644
--- a/rhubarb/src/recognition/Recognizer.h
+++ b/rhubarb/src/recognition/Recognizer.h
@@ -2,7 +2,7 @@
 
 #include "audio/AudioClip.h"
 #include "core/Phone.h"
-#include "tools/ProgressBar.h"
+#include "tools/progress.h"
 #include "time/BoundedTimeline.h"
 
 class Recognizer {
diff --git a/rhubarb/src/recognition/pocketSphinxTools.h b/rhubarb/src/recognition/pocketSphinxTools.h
index 568ccbe..9a72199 100644
--- a/rhubarb/src/recognition/pocketSphinxTools.h
+++ b/rhubarb/src/recognition/pocketSphinxTools.h
@@ -3,7 +3,7 @@
 #include "time/BoundedTimeline.h"
 #include "core/Phone.h"
 #include "audio/AudioClip.h"
-#include "tools/ProgressBar.h"
+#include "tools/progress.h"
 #include <boost/filesystem/path.hpp>
 
 extern "C" {
diff --git a/rhubarb/src/tools/ProgressBar.cpp b/rhubarb/src/tools/ProgressBar.cpp
index 404a6b8..a436e69 100644
--- a/rhubarb/src/tools/ProgressBar.cpp
+++ b/rhubarb/src/tools/ProgressBar.cpp
@@ -3,52 +3,11 @@
 #include <future>
 #include <chrono>
 #include <format.h>
-#include <iostream>
 #include <boost/algorithm/clamp.hpp>
 #include <cmath>
 
 using std::string;
 
-ProgressForwarder::ProgressForwarder(std::function<void(double progress)> callback) :
-	callback(callback)
-{}
-
-void ProgressForwarder::reportProgress(double value) {
-	callback(value);
-}
-
-ProgressMerger::ProgressMerger(ProgressSink& sink) :
-	sink(sink)
-{}
-
-ProgressSink& ProgressMerger::addSink(double weight) {
-	std::lock_guard<std::mutex> lock(mutex);
-
-	totalWeight += weight;
-	int sinkIndex = weightedValues.size();
-	weightedValues.push_back(0);
-	forwarders.push_back(ProgressForwarder([weight, sinkIndex, this](double progress) {
-		weightedValues[sinkIndex] = progress * weight;
-		report();
-	}));
-	return forwarders.back();
-}
-
-void ProgressMerger::report() {
-	std::lock_guard<std::mutex> lock(mutex);
-
-	if (totalWeight != 0) {
-		double weightedSum = 0;
-		for (double weightedValue : weightedValues) {
-			weightedSum += weightedValue;
-		}
-		double progress = weightedSum / totalWeight;
-		sink.reportProgress(progress);
-	} else {
-		sink.reportProgress(0);
-	}
-}
-
 ProgressBar::ProgressBar(std::ostream& stream) :
 	stream(stream)
 {
diff --git a/rhubarb/src/tools/ProgressBar.h b/rhubarb/src/tools/ProgressBar.h
index 0c005c7..7e5bd8f 100644
--- a/rhubarb/src/tools/ProgressBar.h
+++ b/rhubarb/src/tools/ProgressBar.h
@@ -2,45 +2,8 @@
 
 #include <atomic>
 #include <future>
-#include <functional>
-#include <list>
-#include <vector>
-#include <mutex>
-#include <string>
 #include <iostream>
-
-class ProgressSink {
-public:
-	virtual ~ProgressSink() {}
-	virtual void reportProgress(double value) = 0;
-};
-
-class NullProgressSink : public ProgressSink {
-public:
-	void reportProgress(double) override {}
-};
-
-class ProgressForwarder : public ProgressSink {
-public:
-	ProgressForwarder(std::function<void(double progress)> callback);
-	void reportProgress(double value) override;
-private:
-	std::function<void(double progress)> callback;
-};
-
-class ProgressMerger {
-public:
-	ProgressMerger(ProgressSink& sink);
-	ProgressSink& addSink(double weight);
-private:
-	void report();
-
-	ProgressSink& sink;
-	std::mutex mutex;
-	double totalWeight = 0;
-	std::list<ProgressForwarder> forwarders;
-	std::vector<double> weightedValues;
-};
+#include "progress.h"
 
 class ProgressBar : public ProgressSink {
 public:
diff --git a/rhubarb/src/tools/parallel.h b/rhubarb/src/tools/parallel.h
index cca4164..de8c5d5 100644
--- a/rhubarb/src/tools/parallel.h
+++ b/rhubarb/src/tools/parallel.h
@@ -1,7 +1,8 @@
 #pragma once
 
 #include <functional>
-#include "ProgressBar.h"
+#include <future>
+#include "progress.h"
 #include <gsl_util.h>
 
 template<typename TCollection>
diff --git a/rhubarb/src/tools/progress.cpp b/rhubarb/src/tools/progress.cpp
new file mode 100644
index 0000000..34c5848
--- /dev/null
+++ b/rhubarb/src/tools/progress.cpp
@@ -0,0 +1,45 @@
+#include "progress.h"
+
+#include <mutex>
+
+using std::string;
+
+ProgressForwarder::ProgressForwarder(std::function<void(double progress)> callback) :
+	callback(callback)
+{}
+
+void ProgressForwarder::reportProgress(double value) {
+	callback(value);
+}
+
+ProgressMerger::ProgressMerger(ProgressSink& sink) :
+	sink(sink)
+{}
+
+ProgressSink& ProgressMerger::addSink(double weight) {
+	std::lock_guard<std::mutex> lock(mutex);
+
+	totalWeight += weight;
+	int sinkIndex = weightedValues.size();
+	weightedValues.push_back(0);
+	forwarders.push_back(ProgressForwarder([weight, sinkIndex, this](double progress) {
+		weightedValues[sinkIndex] = progress * weight;
+		report();
+	}));
+	return forwarders.back();
+}
+
+void ProgressMerger::report() {
+	std::lock_guard<std::mutex> lock(mutex);
+
+	if (totalWeight != 0) {
+		double weightedSum = 0;
+		for (double weightedValue : weightedValues) {
+			weightedSum += weightedValue;
+		}
+		double progress = weightedSum / totalWeight;
+		sink.reportProgress(progress);
+	} else {
+		sink.reportProgress(0);
+	}
+}
diff --git a/rhubarb/src/tools/progress.h b/rhubarb/src/tools/progress.h
new file mode 100644
index 0000000..23f4965
--- /dev/null
+++ b/rhubarb/src/tools/progress.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <list>
+#include <functional>
+#include <mutex>
+#include <vector>
+
+class ProgressSink {
+public:
+	virtual ~ProgressSink() {}
+	virtual void reportProgress(double value) = 0;
+};
+
+class NullProgressSink : public ProgressSink {
+public:
+	void reportProgress(double) override {}
+};
+
+class ProgressForwarder : public ProgressSink {
+public:
+	ProgressForwarder(std::function<void(double progress)> callback);
+	void reportProgress(double value) override;
+private:
+	std::function<void(double progress)> callback;
+};
+
+class ProgressMerger {
+public:
+	ProgressMerger(ProgressSink& sink);
+	ProgressSink& addSink(double weight);
+private:
+	void report();
+
+	ProgressSink& sink;
+	std::mutex mutex;
+	double totalWeight = 0;
+	std::list<ProgressForwarder> forwarders;
+	std::vector<double> weightedValues;
+};