Doppler's Theme Song:
[youtube]LJ7qXHjxj_0[/youtube]

Because of his greed for power, since he has no power of his own. Give into me is perfect for his want for what other people has, and the nature of the song is perfect for how he views the abilities of the other supers. 

One's Theme Song:
[youtube]e3fqE01YYWs[/youtube]

The immensity of Jupiter pales in comparison to the vastness of the universe, but the sounds of Jupiter are perfect ambient noise for one such as One.