Can you trill on piano?
Piano: While you can play a trill with any two fingers, your strongest fingers—your second and third fingers—are going to be best. Rapidly alternate between the two notes of the trill, ending on the principal note.
Do you trill up or down on piano?
Trills provide the flutes and other woodwinds the opportunity to add brilliance and excitement to a score. Forgive me for stating the obvious, but a trill is a rapid alternation between adjacent pitches, up either a half step or whole step from the notated pitch (never down).