By listening to a song for about a minute and then pressing skip on the remote control. As it turns out I actually listened to all of The Law Maker and Jerusalem but just posted Jeruselam before The Law Maker had finished.
ps - Don't try to be clever it jusrt makes you look stupid.
- didn't listen to the whole songs
- listed the first one at the end of the song and the last one at the start of the song
- listed the next song before i'd finished listening to the previous