Four Chord Song

The idea that many Pop Music songs can be played with just 4 chords - I-V-vi-IV

(cf Copyright Music Hack)

opportunity for MashUp?

http://tvtropes.org/pmwiki/pmwiki.php/Main/TheFourChordsOfPop

Axis Of Awesome version http://www.youtube.com/watch?v=5pidokakU4I

tutorial http://www.youtube.com/watch?v=HiK6dOE8Lw4

http://octaboonaambrosius.blogspot.com/2012/05/101-songs-4-chords.html

Going up to 6 chords on the Uke - http://ukulelehunt.com/2011/09/07/most-common-ukulele-chords/

http://www.ukulele-tabs.com/uke-songs/four-chord-song/four-chord-song-uke-tab-22203.html