Originally Posted by Rhyvven
Yes...it would be. I haven't seen the singing portion but I believe it scrolls the lyrics across. Not sure how you "play" that role in the game either. So unless you knew the lyrics verbatim for every song (thus allowing you to focus on the notes for the instruments), not sure how a "novice" would be able to both at the same time.
Heck...some "real pros" can't do it well on stage....
Singing is handled by a note scroll across the top of the screen. It has a line, just like the other instruments, but flows from right to the left, not from the top to the bottom. Words are shown and their note changes indicated by lines across the music bar.
A singer tries to hit the pitch changes and lyrics for a 'phrase'...for example: "If I stay there will be trou-ble..." is a phrase. You are graded on how well you hit the pitch and timing and scored appropriately. If the phrase is glowing, you get Overdrive (i.e. Star Power). You can trigger it when you get to a certain kind of music bar by doing a yell or appropriately loud noise (I prefer "Yow!" myself) and then, just like a guitar, you get a multiplier bonus for a period of time.
It's possible to do both, but you'd have to know the song fairly well and when the Overdrive trigger points are in that song, so that you could mostly ignore that bar. I expect it would ramp up the difficulty by a BIG notch.