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The piece is called "Piano Sonata No.11 in A Major K.331: I. Theme & Variations" by W. A. Mozart
Please link the video or tell us where to find it
No, Mozart's Violin Sonata in F Major is a secular classical piece, as is most instrumental classical music.
softly, quietly
Piano is short for pianissimo. To play piano means to play softly.
Mendelssohn Piano concerto
Beethoven Piano Concerto 5 -- 2nd movement
Well, it's not a classical piece. it's actually "it's alright" by black sabbath. and if your talking about the thing before that, it's just axl dicking around on the piano. happy to help :D
Never call a classical piece of music a song. It's a piece, and song has lyrics. And probably his Clarinet Quintet or his Sextets for Violin and piano.
Mendelssohn's Wedding March is the traditional piece played at weddings.
The piano player played a melodious piece by Mozart.
It depends on the pianist, and the piece that is being played. -