Tanpopo 's theme for Orphen ♥
a lot of old jpop songs I listen to are used as anime's theme.
Maaya Sakamoto:
TWO-MiX:
T.M. Revolution
Tokuyama Hidenori (more rock than pop)
Okazaki Ritsuko
Okuda Miwako
others
I listen to a lot of others songs that are used for animes. It's a just a first sample.