You might know them but not know you know them.

[arlene516]

For example
If you've heard of Rilo Kiley then you'll recognize the lead singer Jenny Lewis who also sings for Jenny and Johnny.
or
If you've heard of Metric then you know Emily Haines who sometimes sings and tours with Broken Social Scene.

Can anyone give anymore examples of this sort?

[Courtney]

Obscure Bands ft. people from well known bands (http://coachella.com/forum/showthread.php?t=44008)

[arlene516]

Ah thank you wise one

[tessalasset]

It's not just you, arlene, but I really wish we had a rule of like 50 post contributions to other threads before one is able to start one's own thread for the first time.