Beats Music launched with a lot of fanfare today, but you may have noticed that its promised Windows Phone client is missing. What happened? As it turns out, the app is just fashionably late — Beats Ian Rogers says that the Windows Phone edition should be available on January 24th. Thats unfortunate for Lumia-toting listeners who wanted to try Beats Music on day one, but theres no shortage of alternative services to use in the meantime.