The music can be heard on the first level of the first episode.
It's a simple tune.

e|-------------------------------|
b|----------3---3----------------|
G|----0-0-0---0---0--------------|
D|-------------------------------|
A|--3---------------3------------|
E|-------------------------------|

e|-------------------------------|
b|-------------------------------|
G|----------2---2----------------|
D|----0-0-0---0---0--------------|
A|-------------------------------|
E|--3---------------3------------|