What a good thing for you to do, naman.  Music reaches deep places in the memory and is often the last thing to go in people with  dementia.  Music soothes the soul.  Think of the scripture story of the soothing songs of David -  calming King Saul's tormented mind.  It was interesting to note in the Comprehensive Review, that the church is one of the few places where community singing still takes place.

Hi naman - how lovely of you to make that effort.  

Music has the potential to be very powerful - I certainly find it to be an important part of my worship life, and my personal life. 

Could say more about your "addictive aspects" question?  I'm not quite sure I understand it. 

Naman - you might find this site interesting - Room 217 Music - http://www.room217.ca/

A few years ago, I had the great pleasure of hosting the founder of Room 217 for a workshop at my hospital.  The story of how she developed the project, and how the music is altered to attune to inherently calming biological rhythms is really interesting.  I love their CDs, and sometimes play them for my patients - or listen to them myself!!