Mstislav Rostropovich was a maestro on what instrument?
mstislav rostropovich was a maestro on what instrument
FreebaseQA-train-13446.P0 FreebaseQA-train-13446.P1
mstislav rostropovich mstislav rostropovich
mstislav rostropovich mstislav rostropovich
m.0149xx m.0149xx
music.artist.track_contributions..music.track_contribution.role music.group_member.instruments_played
m.01xqw
cello
m.01xqw
cello