The girls (3, 4 and 6 years old) I watch from time to time are obsessed with anything that has a stupid dance they can find on youtube. Like this:
geometry dash 3d
The older girls listen to 90s gangster rap (she's going through a phase) or mainstream country music. The one into gangsta rap has also gotten into Offspring and Papa Roach recently. She found a stack of our old CDs and is in love with older technology. We let her take the old stereo into her room. So she's blasting that stuff at full volume all of the time.