If I Hear 'Spirit in the Sky' in One More Documentary

The music in these sorts of documentaries is what constantly annoys me. It's like the musical director gets a sixties collection from Time-Life and mixes in the most pedestrian original music. You'd think that "Spirit in the Sky" was the only religious-sounding song from the sixties/early seventies. "Gonzo," "W.," "Jesus Camp" and that Ben Stein piece of propaganda--they were all made in between 2006 and 2008. It doesn't matter if the song is used effectively, or if they're hooked on that opening riff, or if Norman Greenbaum's going around GIVING his song away. I do think that this particular song is one of the less original of the one-hit-wonders and Greenbaum's lucky he decided to steal a blues riff to put over some derivative gospel-type background vocals (I like the Stovall Sisters, but this is not their finest moment) behind some cheesy spiritual lyrics, but that's not what is behind this post. The truth is, I could really like "Spirit in the Sky" if I only heard it once every six months going forward--even after knowing it inside and out, note-for-note from the countless films and commercials I've seen it in. I love Jefferson Airplane--I even own some of the terrible bootlegs that are available--but if you watched ten psychedelic documentaries you'd think that they were the only San Francisco band in existence. These choices seem insulting to people who watch documentaries who, I would think, tend to want to be exposed to new things.

My question is the following: when they use the most obvious songs in their films, are the musical directors lazy and/or stupid, do they think that the audience would only respond to familiar songs, have they just been told what to use by the director, or are they trying to compete with mainstream films with their "Forrest Gump"/"Almost Famous" soundtracks? It's clear that all are true to some degree in most films, but what do you think is the predominant factor?

I'll allow for one more possibility: I don't even stick around for the credits of these flicks, so for all I know it's the same person making all of these films. His name's probably Morgan Breennaum.