Your vote for greatest (covers) album

Todd Rundgren - Faithful.   Spot of re-creations of the Yardbirds' 
"Happenings Ten Years Time Ago","Good Vibrations", the Beatles' "Rain" and 
"Strawberry Fields Forever", Dylan's "Most Likely You Go Your Way And I'll Go Mine"
and Hendrix's "If Six Was Nine" 

Try Eva Cassidy "The Best of Eva Cassidy" 2 record set of all or almost all covered songs is the best for me. Her voice is angelic and spot on pitch wise.... almost chilling. Just beautiful. Hopefully you won't be disappointed.

second Rosanne’s The List....you inspired me to start my morning with her :)

Its a mix of originals and covers, but overall one of my favorite albums, Nirvana - MTV Unplugged

Ryan Adams - 1989

I love the man in black’s American series. Johnny’s cover of Hurt on American IV is pretty special

Abba-esque EP by Erasure really jumps first in my mind. Covering 4 ABBA songs and making it completely theirs. 

The Scissor Sisters glam, disco cover of Pink Floyd’s “Comfortably Numb” is so wrong...but yet so right