Complex sentence: There is also a demo-tape of the Elgar Sisters circulating around on the internet, featuring vocal-only tracks that were alluded to in interviews during the "Medúlla" era as early inspiration for the album concept.
Split into simpler sentences: There is also a demo-tape of the Elgar Sisters circulating around on the internet. Notably, this features the vocal-only tracks that were alluded to in interviews during the "Medúlla" era as early inspiration for the album concept.