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diff --git a/libs/vamp-pyin/SparseHMM.h b/libs/vamp-pyin/SparseHMM.h
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+++ b/libs/vamp-pyin/SparseHMM.h
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    pYIN - A fundamental frequency estimator for monophonic audio
+    Centre for Digital Music, Queen Mary, University of London.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _SPARSEHMM_H_
+#define _SPARSEHMM_H_
+
+#include <vector>
+#include <cstdio>
+
+using std::vector;
+using std::pair;
+
+class SparseHMM
+{
+public:
+    virtual const std::vector<double> calculateObsProb(const vector<pair<double, double> >);
+    const std::vector<int> decodeViterbi(std::vector<vector<double> > obs, 
+                                   vector<double> *scale);
+    vector<double> init;
+    vector<size_t> from;
+    vector<size_t> to;
+    vector<double> transProb;
+};
+
+#endif