Trying to find this song?

I heard this song in my friends car, and I'm having a hard time
finding it. I only remember some parts of it. The chorus goes:

"I'm your radio, listen to me when you're low..."
and I don't remember the rest...But some part of the rap goes:

"If I were a boombox, would you turn me up?"

And that's about all I remember from it..Please help, I've been
desperately trying to find it.