Jonas (KN_Fan): In addition to the songs already listed, here are some other song suggestions:

Moondance (Van Morrison)
Red Red Wine (UB40)
I'm a Believer (the Monkees & more recently, from the movie Shrek)
Honky Tonk Woman (Stones)
Under the Boardwalk (Reggae style)
Tears in Heaven (Clapton)

Another successful technique I use for younger audiences is to update older pop standards with a more contemporary groove. For example on the classic early 60's song "More", instead of utilizing the expected traditional 'swing' or 'latin' style, I'll play it with a contemporary funky pop style instead, with vocal harmonizer, and add funky keyboard fills & solos set to a 'stacked elec piano' voice. Very well received and gets the under 30 crowd on the dance floor.

The converse, of taking a contemporary pop song, and performing it in an older retro style (swing, latin, classic R&B) is another thing which can work as well. I find that, though audiences like to hear songs in the style they recognize, they most appreciate hearing fresh original renditions (if its good of course), which will set you apart from all the karaoke style imitators out there, and insure future bookings & client referals.

The great thing about arranger keyboards is that they give us the opportunity to experiment with different styles. While I'll sometimes play a song in the style the original hit was performed (recognized), I find 'mixing it up' with fresh contemporary renditions works best.

Scott