Over the past 3-4 years, I've been noticing a number of anime that credit a person named 外村敬一 ("SOTOMURA Keiichi", it seems) with 主題歌協力 - something like "theme song assistance". This credit, when present, usually appears on the same overlay as the four usual credits for the OP/ED song (vocalist, lyricist, arranger, composer). There are exceptions, though, like the Durarara!! Shou OP "Headhunt", where it appears on the following overlay.
Note that the list of credits on ANN I linked to above is non-exhaustive - I'm pretty sure (just based on my vague recollection of having seen this guy's name over and over) there are a lot more credits for this Sotomura fellow that they haven't added to their database yet. For example, he is credited on "Connect" (the Madoka Magica TV OP), but isn't listed as such on ANN:
- What does this position entail?
- Why have I never seen anyone besides Sotomura Keiichi be credited with it?