I used to take guitar lessons here back in high school days.

These guys offer musical tuitions for various instruments. From percussions to string, piano to brass.

You can also nominate your choice of tutor.
Lessons are usually in 30mins, but you get slightly less than that because you walk in, go up stairs etc etc.

Approximate cost: $35~45

They offer a range of Musical Tuition's at a good rate and are very friendly. They also sell a range of guitars at good prices.