What can be said about this Psalm that hasn't already been said?
It's probably THE most famous of all of the Psalms. I'm sure it's the one that made David famous and was his break into the Psalm writing scene. The poetry is beautiful. The imagery is beautiful. There have been HUNDREDS of songs written based on this text. Here are a few for you to enjoy.
ACDA Senior High School Honor Choir - Music by Paul Basler
Bryn Terfel and the Mormon Tabernacle Choir
Nicole C. Mullen in Zimbabwe