whats the frequency?

i have a serious problem! my car radio complete stopped working. i have no clue what is worng. it was working fine when i dropped max off for school. i came back and it wont work! zip, nada, NUTTIN! now im stuck singing either "back pack back pack" from dora the explorer or " twinkle twinkle little star" to keep audrey happy!
how can i continuely my nerdly existence wiithout NPR in my car???!!