two of my most enjoyable anime songs:
1 - Tomoko tane singing Love Song in the gasaraki ending:
http://www.youtube.com/watch?v=e3GlkU_y-Pw
2 - Megumi Hayashibara singing Sucessfull Mission in Saber Marionete J's opening:
http://www.youtube.com/watch?v=SyPbqc1MRLQ