I don't really understand what your saying. If you're going to put a song in, you should be permitted to use it in your game or add a credits page to your game listing the name of the song and the person who made the song. :)
If “Sky High” is a melody you can hear on the radio it’s most probably copyrighted. You’re not making money out of the game so nobody will make a big deal out of it, but you never know. One rule DOES say that you SHOULD AVOID adding material you don’t have the copyright to or are not given express permission to use.