I'm not a fan of their commercial success tunes but I saw them in 77 at the Music Hall in Beantown and they were great. I saw them on cable recently and they still sound good.
YouTube - Loggins And Messina-Vahevala-09-22-09 (http://www.youtube.com/watch?v=IoDh3fy5ELQ&feature=related)

YouTube - Loggins And Messina-Angry Eyes-09-22-09 (http://www.youtube.com/watch?v=sgEf8inF9rc&feature=related)

I saw them at Schaeffer Stadium in 1972 and they were excellent.