I play music in the background all day, all types. At quiet times, before nap I play the rockabye lullabyes...it's music set to a lullaby tune...you can get anything from U2 to bob marley to nine inch nails...i love it!! Mostly download mine from you tube to my ipod and play it for the dck...I'll play classical music (on low) at quiet times as well. For fun, fast dance, we listen to any kids music collection...

As for bible songs...I would check with parents, I'm sure most won't care but there may be some who would prefer that you didn't.