I concur with UD's points & suggestions.

As an added note: for variety (and stronger harmonic movement), I'll occasionally substitute the IV chord with a ii chord.

Interesting coincidence to see how similar UD's 12/8 feel 'circle of 4ths' medley is to mine. I guess it's because these key's work well match our vocals. The only difference is that I like to do: "Then You Can Tell Me Goodbye" for the 'key of F' tune, utilizing the Yamaha Tyros style: '6-8SlowRock2' for these songs. I also think that the style should have been more appropriately named: '12-8SlowRock2'.

Final note: Though I too include "You Belong To Me" (I assume you meant the Duprees version, right?) in my circle of 4ths medley, the I-vi-IV-V progression (used for the other listed songs), doesn't appear to work on that one. I play:

I - iii - IV - (I -Vm-VI7 / ) - (ii - ivm6) - (I - vi) - II7 - (ii - V)
|Bb | Dm | Eb | Bb - Fm6 - G7 / | Cm - Ebm6 | Bb - Gm | C7 | Cm7 - F7 |

A lot of the folks in my crowd also grew up with these tunes, but even the folks in my generation love these tunes & get out on the dance floor for these songs as well.

Scott