三善 晃 :ピアノ・メソード（全12巻） 練習曲155a 右手の3度の重音の予備練習【第8巻】
Miyoshi, Akira:Miyoshi Piano Method: 12 progressive propositions Preliminary exercise for double notes in 3rd with the right hand
三善 晃 :ピアノ・メソード（全12巻） 練習曲155a 右手の3度の重音の予備練習【第8巻】
Miyoshi, Akira:Miyoshi Piano Method: 12 progressive propositions Preliminary exercise for double notes in 3rd with the right hand
