Yes. The purpose behind these series, from my limited experience, would be an introduction to the artist for a newcomer. For the connoisseur this can be a source of frustration.These series can be confusing for a collector as many a times they are same performances regrouped and/or relabelled. I have a few such duplicates. Another thing they do is cut a raga performance, especially the aalap and vilambit sections to fit in many performances/ragas into one CD. That’s really bad as nothing’s comparable to listening an entire khyal performance over an hour in one sitting. Not talking about Sangeet Sartaj in particular, but classical CD series overall.