Now, don't count me to be 100% true, cause I'm not positive...
The lope and canter were originally supposed to be the same (from what I've heard), but with the slow western pleasure gaits, they slowed down the lope as well. The lope is alot slower than the canter and, IMO, looks painful (it really isn't, just to me it looks that way).
.Delete., Farmpony, and the other people that have Western Pleasure horses probably have videos of the lope, and I definitely (along with lots of others) have canter videos.
Here's the wikipedia definitions on it:
is a controlled, three-beat gait
performed by a horse. It is a natural gait possessed by all horses, faster than most horses' trot
but slower than the gallop
, and is used by all riders. Lope
: a type of slow, relaxed canter seen in western horses, performed on a loose rein with less collection than a collected canter, but at about the same speed or slower. There is less suspension than in an English-style canter. The horse has a longer, less-rounded frame and carries its head lower, but the gait is still 3-beat and the horse must be well-engaged in the hindquarters to do a proper lope