ピアノが

the piano

→ ピアノ
phrase Uncommon #11,032
the piano In expressions such as ピアノが弾ける and ピアノが上手, が marks the activity or skill being described: being able to play the piano or being good at piano. The が is not usually translated separately.
JA: 私はピアノが弾けません。
EN: I can't play the piano.

彼女はピアノが弾けます

She can play the piano.

トムピアノがすごく上手なんです

Tom plays the piano really well.

ベティピアノが弾ける

Betty can play the piano.

彼女はピアノがとても上手

She plays the piano very well.

ママが買ってくれたピアノが昨日届いたんだ

The piano Mom bought me arrived yesterday.

ピアノが違う

The piano is different.

— 海の上のピアニスト (1998)

トムピアノがめちゃめちゃ上手いんだ

Tom is incredibly good at playing the piano.

トムピアノが弾ける聞いてみて

Ask Tom if he can play the piano.

僕はピアノが弾けるのだ彼は思いました

He thought to himself, “I can play the piano.”