I'm not sure if the song is the same or different depending on how you do it, but the song that worked for me to get the second heart container piece from the singing frogs is (A) LEFT, RIGHT, DOWN, LEFT, RIGHT, DOWN, (A), DOWN, (A), DOWN RIGHT, LEFT, (A). You also have to be quick, if you pause too long then you will have to start over. You get to this part after playing the major songs to get them big. The Song of Storms gives you the first heart piece, but doesn't it make one of the frogs grow big.