you do need some kind of mic, but it doesn't have to be a real one... any kind of headset you could talk into (for gaming, even just headphones you'd use to talk on a cell phone) would work.
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I agree 100% with this person, I love to sing as a hobby (like going to box karaoke and such) but even though I have great pitch, my range isn't so amazing, plus I played this in the morning without warming up my voice, and I really wished I'd had the ability to put in both my bottom and top notes so that I could more accurately hit things... I imagine you want the notes to match up with the BGM, but you could just use that info as a branching point for example (a person who demonstrates a wide range could have different notes than a person whose range is narrower, for example, but both sets of notes would go with the BGM). Also unrelated, my suggestion is 2P play with harmonies. That would be amazing. Oh and my final suggestion would be to team up with a poet or song writer to add some lyrics for players to sing... not for the game to detect (that would be hugely irritating for everyone, including players, for lots of reassons) but just so that players don't have to just go around going "la la la" all the time. I would have loved to be singing words. Basically what Rock Band does, just measuring pitch (they don't care if you replace all the words in "Sabotage" by the Beastie Boys with "meow meow meow" as long as the rhythm is correct... XD)