(MUSIC) The last time New York's Diamond Nights played Seattle, they weren't able to fully "unload the pony" because it was a Sunday night. Today you have two chances to hear the best mix of Thin Lizzy, the Cars, and buoyant, balls-to-the-wall libido rock with razor-sharp pop hooks. Expect to really ride with the rock stallions this time around. (Easy Street Records, 20 Mercer St, 691-3279. 6 pm, free, all ages; Crocodile, 2200 Second Ave, 441-5611. 9 pm, $8, 21+.) JENNIFER MAERZ