Changes daily. Depends on my mood really, and even so, it's VERY hard to cut it down to 5.
At this instant in time, my favourites are:
Metallica - Orion
Stratovarius - Hunting High And Low
Stevie Ray Vaughan - Lenny
Ozzy Osbourne - Mr. Crowley
Ozzy Osbourne - Goodbye To Romance
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Mazda Familia Astina History
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SMX