Will Time Machine also back up an attached drive?

I have a MacBook Pro and an external FireWire drive (dedicated to recording audio).
If I attach a second drive (USB if that matters) to be my backup, and then I launch Time Machine, will it back up the data from both my laptop drive and my audio drive? Or will it just back up my laptop drive and I'll have to manually copy the files from my audio drive?
Thanks for any help in understanding.

Yes, Time Machine can back it up, if it's formatted HFS+ (any flavor of +Mac OS Extended.)+
If by chance it doesn't, check the exclusion box in TM Preferences. If the drive is listed there, select it and click the minus sign at the bottom.

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