The polymerase chain reaction (PCR) song

Hat tips:

Evolgen
Biorad
Biosingularity
..And, pretty much everybody else on the Internet.

Can you identify the singers that are being parodies? (or at least, imitated?)

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Fantastic!! Had me in tears! I think my molecular biology collegues will get a real kick out of this one.

I think I picked out Tina Turner, Diana Ross, Bob Dylan, Kenny Rogers and Stevie Wonder, but I'm sure I've missed some.

Willie Nelson?