I’m probably way behind the times here, but today I discovered the London2012 YouTube channel:
http://www.youtube.com/playlist?list=PL47A358CF7BB03109&feature=plcp
where you can find the Olympic mascots’ song “Over the Rainbow” sung by Carrie Fisher and Tom Fletcher with fun animations,
http://www.youtube.com/watch?v=oLDbXIp5atA
and the Olympic mascots, Wenlock and Mandeville, doing the dance moves for the song,
http://www.youtube.com/watch?v=iuI8SizQYnA&list=PL47A358CF7BB03109&index=2&feature=plpp_video
The children will love to sing along, and will pick up the lyrics in no time. You can also buy the track as an Amazon download for less than a pound here,
http://www.amazon.co.uk/Rainbow-Official-London-2012-Mascot/dp/B005QJ3070/ref=pd_sim_dmusic_t_1
And there are a whole host of other Olympic goodies there as well.