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www.angelfire.com]
There are zillions of spin offs from both Eckankar and also from the gurus in northern Indian who came up with this stuff.
Any time you see a flier for an 'Inner Sound' or 'Inner Light and Sound' do a head to toe fact check of the person and organization and put 'controversy' 'cult' and 'problems' in your search engine--thats the way to find any information the group might otherwise not be willing to tell you.
A note about library events:
A librarian at our local branch told me that nearly every so called spiritual group that rented a room at that library went on to generate troubles.
Before you get into a room with anyone, even if they say they are Christians and speak with the tongue of men and of angels, fact check them. Paul said to test the spirits and these days, one method of doing so is to learn to use Google.