To follow Some Kurdish bards, and complementing Dervishes of Kurdistan, besides the diverse regional groups of the Kurdish people the Zaza constitute a substantial, somewhat distinct minority.
Such material as I have seen  refers to groups in east Anatolia (within the borders of modern Turkey), home to a substantial population of Zazas who trace their origins to what is now north Iran. While most are Sunni Muslims, many are Alevi. Their modern history, like that of the Kurds, has been turbulent, with several bloody rebellions against the Turkish Republic, notably in Dersim (1937–38).
The Zazaki language is considered in danger of extinction. This short film includes footage of an Alevi cem ritual (from 7.18):
Hawrami ritual: the Pir Şaliyar festival
To the southeast, way beyond Anatolia, the Hawraman (Avroman) region is also distinctive.
The large village of Hawraman Takht, in the foothills of the Zagros mountains near the western border of Iran (whose economy is boosted by smuggling), has attracted considerable attention for its grand annual festival commemorating the wedding of the ancient hermit saint-healer Pir Şaliyar, with the singing and dancing of dervishes accompanied by daf frame-drums.  Here’s a short film: 
It’s such a scenic village that I can’t help wondering how representative the festival is of ritual practice in the region, how it has changed in recent years under the influence of tourism (itself a valid subject of research, though I suspect this is the kind of event that many an anthropologist might avoid), and the routine practices of the dervishes once the visitors are gone.
In the same region, I’m keen to learn more about siyaw chemane singing.
 See e.g. Mehmed S. Kaya, The Zaza Kurds of Turkey (2011); Paul White, here; abstracts from a conference on the Zaza in Anatolia—with many papers devoted to Alevism, and one on the actor and film director Yılmaz Güney (1937–84), among several Zaza with a high public profile; https://zazaki.de/index.php/en; and even wiki (here and here). I note en passant that Zaza means “stammerer”.
 While I have yet to see more in-depth studies, brief media articles include
 This introduction is longer but far from ethnographic:
Some other brief clips:
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