In one of my first production classes in film school we had to take a song that was at least three minutes in length, grab a section from the beginning, middle and end, and cut it down to exactly one minute.
It's a very interesting exercise. And I have had to do similar things since then in my productions.
Weddings, for example. The bride and groom have an uncle sing a song because they think it would be nice, or they have to, or someone held a gun to their head and made them ask... whatever. The end result is a four minute song sung by an amateur that makes up a tenth of the whole ceremony. Pretty lame.
So, as an editor, my job is take that really long, boring, and, honestly, pointless bit of auditory torture and make it thirty seconds of amusing interlude before the kiss.
Easier said than done.
If you've never tried editing a song down, give it a whirl. It can be really fun, and sometimes funny, to hear the results.
Your Media Production Mentor