Where can I find the proper runescape theme music?

Like, I'm talking about the high-quality version played on the guitar, not some shitty 16bit version that they play in lumbridge.

RuneScape - MMORPG - The No.1 Free Online Multiplayer Game

The start of that video, the first few seconds. Where can I find the full song of it? (if it exists)

Does not exist, They wouldn't spend so much time doing it.