Help identifying a song within a song

So I've been listening to a song, found here, and I'm sure I recognise the tune that's beneath that song, from a different song.
So I'm wondering if anyone knows of the name of the song that is going on in the first 5 seconds or so, then is kind of mixed up for the rest of the track.
Cheers!
So I'm wondering if anyone knows of the name of the song that is going on in the first 5 seconds or so, then is kind of mixed up for the rest of the track.
Cheers!