Thanks for your reply John.
I Think that classic music is the best for background music in most of the "situations.
And yes I was a little surprised that the pros used BIAB a lot.
I have used BIB as backing tracks for songs, but the there was a voice or acoustic solo instrument as a lead, and the BIAB was the backing tracks. I have found that it is much more difficult to make a realistic "instrumental" and I dont understand how it is possible to make a believable classic piece with BIAB alone.
If somebody have some examples or sugestions how this can be done please tell me.
I played the Symphony No3 By Gorecki. An it was a sad thing, but wery useful if we want to make a documentary from a nazi consentration camp. Do anyone have a sugestions what cind of Classic music express beauty?

Best regards
Tono