I know what a trill is, on guitar it would be like a constant hammer on - pull off sequence. But in this song:http://conquest.imslp.info/files/imglnk ... ivaldi.pdf
the violino principale performs a trill on the same note Bb. Is that possible on guitar? Or is only possible on a violin due to the vibrato or something?
Even so, I'd like to know how to perform a trill on one note (or what it means)