I recently saw an interesting article in which the speaker maker Sonus Faber revealed 5 songs they use to test their speakers before release (below). I thought this would be an interesting topic to explore because there would be specific reasons why audio professionals would select particular songs.
When I test new gear, these are the first three songs I play:
Norah Jones, Come away with me (Redbook CD)
Andy Bey, Never let me go (Redbook CD)
Dire Straits, Latest Trick (SACD/DSD)
What are yours?