Denise

I never realized this song was called Denise despite every verse starts with "Denise, Denise".
Half step key change by Randy and the Rainbows and Blondie.

-Tony Trov

Cupid I've Loved You For a Long Time

Cupid I've Loved You a Long Time is such a funny disco medley. This key change comes when The Spinners reprise the first song into a key change.
Also special note, this rendition has got to be the reason why Rod Stewart coved it as well.
-Tony Trov

That's How Heartaches Are Made

Try this from BB Washington.
-Joanna

I'm Not a Girl, Not Yet a Woman

From the album Britney by Britney Spears.
-Matthew