Good pubs in Derry??-10 points!?

hey everyone, I know this is in the Belfast section, but I wasn't sure where else to put it... my sister and I are going to be in Derry for 4-5 nights and just wondering whats a few good pubs to visit?? I love live music with a good pint where can we find that in derry?? will be staying at a hostel near the walls so walking distance or bus is good...thanks a ton!!