Spanish Johnny is also a character in Willa Cather's novel, "The Song of the Lark." This quote is from an article by Dr. Betsy McCully Cooper:

As Thea matures, Dr. Archie often takes her on his rounds, showing her a side of life that she would otherwise not see. In Mexican Town, for example, she meets Spanish Johnny, a wandering musician given to bouts of drinking and madness, and his long-suffering wife, Mrs. Tellamantez. It is when she sings a duet with Spanish Johnny at a dance in Mexican Town that she discovers the natural tones and sensual depths of her true voice.

Bill Hinkley and Judy Larson do a nice version of "Spanish Johnny" on their album "Out in Our Meadow," Red House Records, RHR15.