It's a religious song about the joys of attending church! Bell ringers ringing the bells to call people into the church (ding ding dong) and the choir singing (tra la la). As for the touching.... erm they are touched by the power of faith and unity.
Edit: And if you think that song's good check out the awesome dance in the song "no pantalones" which I probably can't paste here (NSFW) but it had me and my lady in stitches and quoting it for ages.
@Neil.T was quoting the song to me over the phone and I can't unhear it now!
Neil - you owe me...an ice cream!