I've become obsessed with 18th Century Britain, particularly London and novels - but most things are fair game.
I go through different band and genre obsessions that turn on and off - last big one was atonal post punky stuff, before that girl groups and before that sea chanties and ballads.
Certain people, the Sammy's (Johnson and Pepys), Sterne, Fielding - John Gay.
Just got meself a boatswain's whistle I'm trying to learn.
Indeed - I have even more hobbyhorses now than before.