According to AT&T's estimates, you'd have to stream 6 hours of music a day, every day of the month, to hit the 5GB bandwidth limit. Six hours. Every day. If that's "useless" to you, so be it.
Throw in some occasional Netflix and Youtube videos and your bandwidth is chewed up real quick due to LTE being faster than most home internet. Luckily I can get Wifi throughout where I am so I don't have to gobble up all my allocated bandwidth.