In order to find accurate information like discographies with catalog numbers, mono/stereo, other releases, Uk Charts, Weeks in Charts, First Week in Charts, High Position, Reissues, lyrics, video and more for several bands and artists i recommend www.discoogle.com
Some interesting examples are:
Rock
http://www.discoogle.com/wiki/Beatles%2C_The
http://www.discoogle.com/wiki/Beatles%2C_The_Lyrics
http://www.discoogle.com/wiki/Beatle...he_Discography
Rock 'N' Roll
http://www.discoogle.com/wiki/Presley%2C_Elvis
http://www.discoogle.com/wiki/Presley%2C_Elvis_Lyrics
http://www.discoogle.com/wiki/Presle...is_Discography
Heavy Metal
http://www.discoogle.com/wiki/Iron_Maiden
http://www.discoogle.com/wiki/Iron_Maiden_Lyrics
http://www.discoogle.com/wiki/Iron_Maiden_Discography
modern rock (Alternative/Indie...)
http://www.discoogle.com/wiki/Razorlight
http://www.discoogle.com/wiki/Razorlight_Lyrics
http://www.discoogle.com/wiki/Razorlight_Discography

and select general categories

http://www.discoogle.com/wiki/Category:Artists
http://www.discoogle.com/wiki/Category:Bands
http://www.discoogle.com/wiki/Categoryiscography
http://www.discoogle.com/wiki/Category:Lyrics
http://www.discoogle.com/wiki/Category:Musicians

See U!