It's likely to be a bootleg series I used to have them. Someone decided to cash in on the popularity of the Sitar Headswirlers series by doing their own. I can't recall the exact title of it but it's not too disimilar to the 'psychedleic sitar headswirlers' name. I think Midnight Records in NY were selling it at one time but I may be wrong.
Yes Phillipe you may be correct as i found more volumes elsewhere so have 19 volumes now and ive listened to a few tracks and they are certainly not indian classical music..mind you some of the tracks i listened to leave a bit to be desired