musical orgasm
The point in a song where the tune or beat rapidly switches from mellow to super intense. Or a song which builds up slowy to one huge instrumental explosion. Usually musical orgasms consist of an intense drum beat or guitar riff. A few examples are 'Radiohead - Fake Plastic Trees' at 2:36, or 'Coldplay - Fix You (album Version)' at 3:02. 
This song as an flawless musical orgasm about three minutes into it.