Mine are usually

- hearing indistinct voices, like people having a conversation on the other side of the wall (this is the most common for me)
- soft music, like from a music box
- my mother's voice saying my name (has happened a few times - she lives in a different state)

Mostly it happens when I'm at home in a quiet room, except hearing my name - that's happened several times in public/crowded areas. The conversation and music I can usually reality check by trying to pinpoint the source. It's always directional (coming from behind me/off to my left/etc) but if I try to move closer to it or move to a different part of the room it seems like the sound also moved to stay the same direction/distance from me, if that makes sense.