If you're looking for high tenor songs, you might start by looking at songs by Journey (Steve Perry), Queen (Freddie Mercury), and Styx (Dennis DeYoung). Those guys were all super high tenors and have some great songs that work really well in auditions. Listen to samples on iTunes and then whole songs on YouTube and you can probably find one you like.
For more current pop, listen to the radio a bit. Listen to songs in commercials and songs in the background of TV/Movies. If you hear something that catches your ear, find out what it is and look for the music and recording. And seriously, check out old episodes of American Idol for ideas, especially the early rounds. Literally hundreds of pop songs being used for auditions.