depends on the type of club...lol
current: Don't Stop The Music (Rihanna), Single Ladies (Beyonce) Let It Go (Keyshia Cole, Missy & Lill Kim) The Way I Are (Timabaland & Keri Hilson), Lose Control (Missy), 2Nite (Janet) Everytime That Beat Drop (Monica), Gold Digger (Kanye West), Milkshake (Kelis), My Love (JT & TI), Yeah! (Usher & Ludacris), Goodies (Ciara), All Nite Don't Stop (Janet), Lose My Breath (Destiny's Child) would all get the party started in my neck of the woods
retro: Atomic Dog (George Clinton), One Nation Under the Groove (Funkadelic), Super Freak or Give It To Me Baby (Rick James), Don't Stop Til You Get Enough (MJ), Let's Groove or September (Earth Wind & Fire), Cool It Now (New Edition), Take Your Time (SOS Band), Real Love (Jody Watley), Let It Whip (Dazz Band), My Prerogative (Bobby Brown), Let The Music Play (Shannon), Superstition (Stevie Wonder), Candy (Cameo), Feels Good (Tony Toni Tone), If or Rhythm Nation (janet jackson), Flashlight (Parliament) 1999 or Let's Go Crazy (Prince) are all great classic grooves
but obviously these are all more urban oriented jams....