Peggy Lee, who, along with Sinatra producer/arranger/songwriter Sonny Burke, created the songs for the film, later sued Disney for breach of contract claiming that she still retained rights to the transcripts. She was awarded $2.3m, but not without a legal battle which was settled in 1991. Of all the great songs they wrote for Lady and the Tramp, I'm rather partial to "The Siamese Cat Song," on which, thanks to early multi-tracking, Lee sang both parts.
I later saw my first XXX rated movie there as well (irony), but I regress. Incidentally, Lady and the Tramp was the first Disney animated film released only on DVD (the last released on VHS was Bambi II). Even as a child this stirred me (there is something about that last verse, when the "Disney singers" repeat the chorus, that is like a time machine straight back to childhood):