GirlsDeMo is a real band?!

yesterday when i was browsing for little braver, i accidentaly visited YouTube and found the REAL GirlsDeMo video clip of Little Braver!

watch this

or visit this : http://www.youtube.com/watch?v=2jQB6kbiEvo

one of the comment authors said :

“Oh Yeah! GirlsDeMo is “technically” a real band. The instrument players are the ones that play all the GirlsDeMo songs while the the singer is not “in” the band itself. Lia is her own individual and not part of an “official” band. Her singing with the instrument players makes “GirlsDeMo”.

and my friend said the ‘real’ GirlsDeMo have (or maybe will be have) a live concert.  The real matter is, is GirlsDeMo  formed BEFORE Angel Beats! created or AFTER Angel Beats! ? because the band only play the instrument. without  Marina (iwasawa) and LiSa (Yui) they can’t be GirlsDeMo right? meanwhile Marina and LiSa are individual singer. They’re not included in the ‘real’ GirlsDeMo band.

oh..uh..my head hurts -_-