I recently purchased the underscore soundtrack to the 90ies series, 'Charmed', composed by J. Peter Robinson, that was released mid-2013.
Being a huge fan of the series and an instrumental musical lover, I was so excited that this was released. The fact that it has taken approximately ten years to be officially released baffles me, but I guess I have to be thankful they bothered releasing it at all. I had been searching for years for the underscore as I appreciate the great depth and significant contribution music tracks give to film and television.
Even if you don't actively listen to a movie or TV show's soundtrack whilst watching, its presence is always felt in an emotional, passive way. In fact, not noticing a soundtrack playing underneath is a good sign of an excellent composer, as they can convey the right type of emotion without being overly intrusive.
A great example is the Lord Of The Rings soundtrack by the genius Howard Shore. I guarantee that the movie trilogy would not have had such an impact on movie goers if not for the soundtrack. I personally get goose bumps when I hear the earthly theme of "Concerning Hobbits" and instantly get transported back to memories of Middle Earth!
My iPod is full of instrumental soundtracks from all sorts of movies and tv shows and I am glad to add the Charmed CD to that collection. It always fascinates me how much emotion each track triggers, whether it be to accompany a love scene, a battle with demonic enemies and even sad themes.