First problem: Sony didn't bundle any microphones with the game. They assumed I had some from the PlayStation 2 version lying around.
No worries. I figured I'd just pop in the "Rock Band" microphone already in my possession. Technically, it's an Xbox 360 accessory, but it works fine as a normal microphone on my laptop, so why not "SingStar" on my PS3? Singing The Pixies' "Here Comes Your Man" was within in my grasp.
Bzzt. No dice. "SingStar" kepts asking for a USB converter bundled with the "SingStar"-branded microphones. I asked Sony if I was simply doing something wrong. In response, they sent me a pair of microphones. When Sony delivered the microphones and USB converter to me, I realized it only accepted the inputs on the "SingStar" microphones. My "Rock Band" microphone was rendered useless.
Like I said, though, the microphone is technically bundled with the Xbox 360 version. I don't have access to the PlayStation 3 "Rock Band" microphone, but there's a good chance it won't work, either. If you have any success, let me know.
In a last ditch attempt to get my karaoke on, I synced my newly acquired "Metal Gear Solid 4: Guns of the Patriots" Bluetooth headset. The Xbox Live headset works just fine in "Rock Band," even if the quality takes a dip.
Bzzt. Bluetooth headset denied. Sony wants you to use their microphones.
On the plus side, the "SingStar" microphones are really nice, heavy and durable. It's just too bad you only have one option.