Alphabet Song, stuff like that etc...songs can't teach you life lessons because unless you actually experience whatever the song is saying you can't say you get it.
I would say all the Lemonade Mouth songs.
Here We Go- Fight the power and stand up for what you believe in.
Determinate- Make life a party and enjoy it.
Somebody- My time to shine will come soon
She's So Gone- I'm a different girl now
Breakthrough- Don't stop what I'm doing 'cause it sure as heck will get me somewhere in life.
Livin' On A Highwire- I might be crazy but I know what I'm doing.