best vocal harmonies in rock

Yup, it's been said before...... Crosby, Stills, and Nash.

Beach Boys
Everly Brothers
Crosty Stills, Nash Everly Brothers
Pointer Sisters (Rock?)
Friends of Distinction (Rock?)
Association
Poco
New Riders of the Purple Sage

are among my a few of my favorites

And then there is Motown (little mentioned on this site, wonder why, no Motown fans?)

Marvin Gaye and Tami Terrell
The Four Tops
Temptations
Supremes
Martha and the Vandellas

Earth Wind and Fire

I really don't care what the genre, I love listening to groups harmonize.

The Association-Buckinghams-Cryan Shames

and one more that is conspicously missing and among the very best with some great instrumental AND vocal harmonies

Little River Band

Oh I guess I missed them on the first page.