"Louie, Louie" -- definitely Carl singing
Has any Pet Sounds issue correctly identified Al as one of the "I Know There's An Answer" lead singers?
And of course, "Summertime Blues" - Carl on at least one of the vocals, and according to the engineer voice-over on UM1, "Ni[c]k."
Not to mention countless Theremin references (then why did I mention it?)...most recently appearing in a Goldmine article, which prompted a letter-to-the-editor from, as Domenic Priore would say, "yours truly."