Mark, That "South Street Waltz' is a great song. Reminds me of the songwriter Benny Davis's* younger sister Celia in her latter years. She had been a jazz singer, and at the time I knew her, several years before her death, she suffered from advanced dementia, but when the music to a song she knew started--and she knew just about every popular American song written before 1975--her face would light up and she'd sing every word!
That song also brings to mind Nanci Griffith's song "Love at the Five and Dime." No memory loss mentioned in that one, but the young couple age together, through the arthritis that takes Eddie's ability to play his musical instrument, etc., and they're still dancing "a little closer" into their golden years.
*Benny Davis co-wrote "Baby Face," "[My Little] Margie," and other popular US hits of the 1920s and '30s.