Only two tracks to test your system, forever!

If you could only use two tracks/songs for the rest of your life whenever you wanted to test a change to your system, what would they be?


Does anyone remember Pink Floyd? Certainly, "Us and Them" and "Shine on You Crazy Diamond (Part 1)" are great system testers. And, your 20 year old self would be proud of those choices.

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With only two tracks to listen to I’d give up, audio drag racing just isn’t the point.