Since my goal-- as a songleader more than an interpretive performer-- is to let folks know how to go back to the sources I learned from, and hear them for themselves, I try to include what will help with that. The wording of the "learned from" citation depends on how much my version is like the one I heard.

I do use it to highlight that the material is rare, vintage, field-collected. Not to ride on Lomax glory but to shine a light back to the people whose songs he collected. To personalize the song's context.

Don't worry about letting people know you learned from a recording. Doc Watson's happy to say he did!!!!!!!!! (And aren't we all glad he did.) Minimize it if you wish by shifting the emphasis to a short and colorful description of the artist. ("Learned from the singing of xxx, a wonderful xxx from xxx in the [decade] who had a great interest in xxxx.....")

~Susan