This piece features a good workout for the left hand with many hammer-ons and pull-offs in various positions up and down the guitar neck. This work is known as an etude and is written specifically for the development of technique while still being entertaining and harmonious. Matteo Carcassi wrote many such etudes for his Op. 60.
Find free sheet music for this piece below the video.
Matteo Carcassi's Op. 60 Etude no. 9 performed by Per-Olov Kindgren