In game music is from Tetris (originally Russian folk song). Intro music is ripped off from Mega Man 2, from the first Doctor Wily stage. So, yeah, it is good music.
No offense, but I don't ever want to see the code for this game. From the look of it you probably accomplish most things by the most needlessly complex, roundabout way you can think of.
Cheat: Gently land the rocket right after takeoff. Rock it onto it's side. Then press and hold DOWN and the direction that the rocket is aiming (LEFT if it's pointing left RIGHT if it's point right). While holding the two arrow keys click a different tab. Leave the game overnight and come back 24 hours later with basically unlimited cash. (probably a good idea to mute it first)
NERDOOK HOW ARE YOU SO UNSTOPPABLY PROLIFIC. Will you please program a cure for cancer the next time you get a few minutes of free time? While you're at it you might as well write an "I cured cancer song" that I can't get out of my head for several months.