The proposed method was evaluated by using 3 classical music pieces listed in Table 2 recorded in the MIDI format, which were performed 2 times by 5 players for each piece. 19 kinds of note values (whole note, quarter note, etc.) were treated and represented by 6859 () hidden states in the HMM, whose transition probabilities were trained by 13 classical pieces containing 4355 note values, and whose output probabilities were trained by 2 music pieces by 2 players containing 1288 IOIs. Rhythm recognition rate RRR-1 (first estimation of rhythm) and RRR-2 (rhythm estimation after tempo estimation) were obtained as shown in Table 3. ``Prep'' shows the rate of correct preprocessing (synchronizing grace notes, etc.).
J. S. Bach: Fuga in C minor, BWV847, Well-Tempered Clavier Book I.
L. v. Beethoven: Piano Sonata No. 20, 1st Mov.
R. Schumann: ``Traumerei'' from ``Kinderszenen,'' Op. 15, No.7.