Don't get me wrong, I love the score. Most of it, anyway. I find that musical theatre is supposed heighten an emotion through song, the song in question should only come when the character has no other way to express themself. I feel that there are moments in the stage version of Oliver! where music is just not needed.
And what I mean by Bill Sykes being hardly mentioned in the first act is that the references to him don't mean anything if it is not explained who he is. When Fagin says that Dodger is bound to be another Bill Sykes and Nancy sings "Even fight my Bill?" and Didger replies "What?! Fisticuffs!", they don't really mean anything. I remember when I first saw the show I didn't laugh at the "fisticuffs" line because I had no friggin' clue who they were talking about. I wouldn't mind it if they briefly mentioned Bill Sykes and left him a mystery until Act 2, but constant mentions of him without any explanation is annoying, I find.
And yes, I have that recording on cassette. The actor gives an appropriately raw performance of it, but I still find the song laughable. Simply because of its placement in the show. Bill Sykes does not seem like a character who would sing. I really don't like the Nancy on that recording, though.
"Sing the words, Patti!!!!" Stephen Sondheim to Patti LuPone.