OH YES! I did fine arts for 3 years. made it to nationals 2 years in a row for keyboard solo. i will give you a few songs to choose from ^_^
http://www.youtube.com/watch?v=bmtj4mIxkd0 (i forgot to check if it was under 5 mins, sorry >.<)
this song is awesome. it is under 5 mins. about the same speed as the other song u wanted to do.
http://www.youtube.com/watch?v=2mZaUE12SZQthis one is lower pitch
http://www.youtube.com/watch?v=VRiBMG26-DEThis one people like a lot, the choice may score you points. remember, song choice is very important. if its a well known and well liked song, it will lean in your favor. May i ask, what district are you competing in? I was in the potomac district.
http://www.youtube.com/watch?v=MmUDDxflt6olet me know if any of these help. if not i can look for more. i dont have access to my ipod atm, its in my car >.< lol