IMO -
Top 3 US Amphitheaters (in terms of ambience and acoustics):
Red Rocks
The Gorge
Hollywood Bowl
Top 3 Bands I Never Got To See:
Led Zeppelin
The Doors
Bob Marley
Top 3 Unsuspecting Live Acts You Should See at Least Once for Musicianship:
Sade
Rodrigo Y Gabriela
The Roots