Error, cannot find time of performance!!!pid:				pid9103-07
!!!performer:			Blet
!!!year:			2003
!!!track_duration:		-1 seconds
!!!mazurka_id:			mazurka17-4
!!!mazurka_title:		Mazurka in A Minor, Op. 17, No. 4
!!!performance_beats:		396
!!!performance_duration:	247.8 seconds
!!!performance_avg_tempo:	MM 95.88