Hi Topoford,
I am a big fan of meditation
Not easy for me to recommend anything simple when it comes to this topic, but here is some stuff that I know well and like:
Audios from BrainSync - some of these are only tunes, others contain guided meditations:
Brain Sync | The Leader in Brainwave Technology
Not familiar with anything Christian in this area, but if you are open to other types of spiritual systems, I have been following Alan Wallace's methods for years.
Under "Podcasts" on this site, there is a selection of audios from his various retreats. He's a Buddhist scholar but philosophy is pretty compatible with many spiritual interests, I think, and quite timeless. His main method is a Samatha-Vipassana type approach.
http://www.sbinstitute.com/
I hope others will also post as this is a topic that is being discussed quite often and there have been simpler links going around. Try to do a search here on SR for older threads with the keyword "meditation".