What are the 3 lines of music in piano sheet music?

Answer 1

Forms of music definitely varied and changed based on the time period, but you could consider the most basic forms to be the concerto, sonata, etude, prelude, waltz, and nocturne. However, there are many, many other types of piano music.

Answer 2

Its the chord progressions of your piece of music. You will base the rest of what you play by the progressing chords on the lines.