Underrated...

Some Underrated guitarists.....

Joe satriani (solo).... hands down
David gilmour of pink floyd
Brian May of queen
Alex Lifeson of rush
Zack Wylde of Black sabbath/Black Label
George Harrison of the beatles

Some Underrated drummers

Mitch Mitchell-Jimi Hendrix experience
Ian Paice-deep purple
Ringo starr-Beatles
Peter Criss-Kiss
Nicko Mcbrain-Iron Maiden

Some Underrated Bassists

Krist Novoselic-Nirvana
John Paul Jones-Led zeppelin
Steve Harris-Iron Maiden
John Myung-Dream Theater

Some Underrated singers

Bruce dickinson-Iron Maiden
Ian Gillian-Deep purple

MOst underrated song in my opinion is Achilles last stand by led zeppelin..it's just my opinion