Live version of the Nanoha Strikers OP. "Secret Ambition."
[ame]http://www.youtube.com/watch?v=rVI7Q9wfKEE&feature=channel_page[/ame]
..and also an old favorite:
The lead singer of the band that did the Saint Seiya OP teaming with Masaki Endo for "Pegasus Fantasy".
[ame]http://www.youtube.com/watch?v=Vg_oWp-dMOg&feature=channel_page[/ame]