I tend to prefer the quirkiest of solo albums, so here's a selection of those:
Colm Wilkinson- COLM C. T. WILKINSON. Before his incarnation as Broadway leading man, producers weren't quite sure what to do with the eclectic tenor, and this (bootleg?) compilation has everything from folk rock to broad easy-listening pop, with a few bizarre but convincing stabs at Seventies hard rock. The best cut, "R&R Music," sounds like Led Zeppelin playing the score to Rocky Horror.
Mandy Patinkin- MANDY PATINKIN. It's not the best known or best-regarded of Patinkin's albums, but it's the strangest and most fascinating. The "somewhat overindulgent" star embraces everything from Sondheim to blackface-era minstrelsy, memorably impersonating an entire diner on "Coffee in a Cardboard Cup."
Tim Minchin- SIT (as Timmy the Dog). Acclaimed musical star and composer Minchin has released several albums of his live act, but only one out-of-print studio album which has no overlaps with his other released material. The usual elements are there, with wordplay, jazz piano interspersed with singer-songwriter pop, and monologue-like lyrics.
Tim Curry- READ MY LIPS. Curry's high-camp second solo album (his first, "...From the Vaults," was canned and not released until a few years back) is full of grandiose and bizarre gestures- it's Bob Ezrin meets Harry Nilsson, with a dash of the Muppet Show. Like the better-regarded Nilsson, Curry bounces between genres with an eye for the kitschy and the sentimental; he shares Nilsson's love of phony accents and Caribbean rhythms. The moments played straight (pun not intended- for a man who has never been open about any element of his personal life or sexuality, this is a really REALLY gay album) are among the best- "Sloe Gin" is a long, dark blues number, and "Alan," one of the most Nilssonesque pieces, is a slice-of-life portrait of two lovers heading home after another night ended in an attempted gay-bashing.