J. Pachelbel, Canon in D major

Pachelbel's Canon is a popular piece you may have heard before. A canon is a musical device in which 2 or more voices play the same melody, entering at different times. You may have done something similar by "singing rounds" of a song. Enjoy the following video of this beautiful piece accompanied by a scrolling score where you can see exactly what each instrument is playing.

Questions

Have you ever sang rounds of a song before?
What is the texture of this piece, or any canon? (Homophonic, monophonic or polyphonic) Refer to previous listening activities if you need a refresher on music textures!