Morgana Lefay covered "Razamanaz" by Uriah Heep,
'Razamanaz' is originally from Nazareth (Agnew, Charlton, McCafferty, Sweet), from their third album of the same name.
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Some already mentioned, some maybe 80's:
Angel Dust - 'Spotlight Kid' (Rainbow)
Angel Dust - 'Temple Of The King' (Rainbow)
Angel Dust - Easy Livin' (Uriah Heep)
D.C. Cooper - Easy Livin' (Uriah Heep)
Judas Priest - 'Diamonds And Rust' (Joan Baez)
Judas Priest - 'Better By You, Better Than Me' (Spooky Tooth)
Judas Priest - 'The Green Manalishi' (Fleetwood Mac)
Wolf - (don't fear) The Reaper (Blue Oyster Cult)
Lion's Share - 'Sorcerer' (Angel Witch)
Glenn Tipton - 'Painted It Black' (Rolling Stones)
Rage - 'Painted It Black' (Rolling Stones)
Metal Church - 'Highway Star' (Deep Purple)
Primal Fear - 'Speed King' (Deep Purple)
Riot - 'Only You Can Rock Me' (UFO)
Riot - 'Here Comes The Sun' (Beatles instrumental version)
Riot - 'Out In The Fields' (Gary Moore)
Superchrist - 'Fire Down Under' (Riot)
Nightwish - 'Over The Hills And Far Away' (Gary Moore)
Metallica - several bands in "Garage Inc. (disc1)"
Voivod - ' Astronomy Domine' (Pink Floyd)
Yngwie Malmsteen - 'Gimme! Gimme! Gimme!' (ABBA)
Sinergy - - 'Gimme! Gimme! Gimme!' (ABBA)
Sinergy - 'Hanging On The Telephone' (Blondie)
Skyclad - 'Emerald' (Thin Lizzy)
Skyclad - 'Dreamer Deceiver' (Judas Priest)
Therion - ' Southbound' (Thin Lizzy)
Hammerfall - 'My Sharona'
Heathen - 'Kill The King' (Rainbow)
Liege Lord - 'Kill The King' (Rainbow)
Intruder - (I'm Not Your) Stepping Stone (Paul Revere & The Raiders, also The Monkees)
The metal tribute to ABBA has several well known bands in here
Hammerfall has a complete album of covers (some 70's)
Overkill has a complete album of covers (some 70's)
Yngwie Malmsteen has a complete album of covers (some 70's)
I'm tired...