It depends on the song. I think I usually sing on medium or hard. My favorite song to sing is "So Whatcha Want." I can sing that on expert and play the bass on expert also.
lol I play the guitar on medium most of the time, If I have to I will sing but thats only if my cousins, who usually play with me, don't want to sing. I am the worst person to play the drums.
lol cool was it Sorrow's? And well it is a mixture of a lot of different things. I am on Pandora and the radio station I am listening to is Ayumi Hamasaki. But right now the song is Hello Seattle by Owl City. (don't ask me why owl city is playing on a Japanese music station, i don't know)