Infernal Devices (Infernal Devices #1) by K.W. Jeter

HE INHERITED A WATCHMAKER'S STORE - AND A WHOLE HEAP OF TROUBLE. But idle sometime-musician George has little talent for clockwork. And when a shadowy figure tries to steal an old device from the premises, George finds himself embroiled in a mystery of time travel, music and sexual intrigue. A genuine lost classic, a steampunk original whose time has come.