'learn piano' is correct and usable in written English.
You can use it in various contexts, for example: My goal this year is to learn piano.
"All through my childhood, my parents made me learn piano," he said.
That skill enabled Diangienda to learn piano, guitar, cello, trombone, and trumpet, and it was crucial twenty years ago, when he started the Kimbanguist Symphony Orchestra, in Kinshasa, the capital city of the Democratic Republic of the Congo.
But he began to learn piano, at first from a local boogie-woogie pianist, Wylie Pitman; he also soaked up gospel music at the Shiloh Baptist Church and rural blues from musicians including Tampa Red.
If this works it could modernize the way people learn piano.
I know, for sure, that this is how I'd like to learn piano.
It enabled me to learn piano and violin starting at 4, progress quickly, and always play in tune.
"My sister and I learned piano and I was in a children's opera group.
"I grew up learning piano, was classically trained and not a lot of people know this.
From an early age, Fontella sang in public and learned piano and organ.
He began learning piano at six before moving to New York 11 years ago.
He learned piano by the Braille system, not by remembering a bar at a time, as has been said.
