Chinese tech giant Tencent (NASDAQOTH: TCEHY) plans to spin off its streaming music unit, Tencent Music Entertainment (TME), in a U.S. IPO, according to a recent company filing. This move would be surprising, since shares of Tencent and its digital books spin-off, China Literature, only trade in Hong Kong.Tencent hasn't released any additional details about TME's IPO yet, but previous reports suggested that the IPO could raise $1 billion and value the company at $30 billion.