YOU SAID:

I wish i was better at singing while playing the piano.

INTO JAPANESE

私はピアノを弾きながら歌が上手になったことを願います。

BACK INTO ENGLISH

I hope the song gets better while playing the piano.

INTO JAPANESE

ピアノを弾きながら歌が良くなることを願っています。

BACK INTO ENGLISH

I hope the song gets better while playing the piano.