I don't know if I have a chance of getting an answer here, but I've exhausted the obvious sources. I'm trying to get a mechanical license to release a recording of "Won't Give In" that I did with my brother. BMI lists Rebel Larynx Music (Tim's publisher) as being affiliated with Wixen Music, but Wixen tells me that they no longer administer Rebel Larynx. I checked with Chrysalis Songs, which currently administers Neil's Roundhead Music (which also used to be with Wixen), and they don't have Rebel Larynx either. Chrysalis told me that, to get a mechanical license, I'd need to communicate with both co-publishers.
Any thoughts on how to contact Rebel Larynx, or on what my next step should be?