Song difficulty ratings

Here's a complete list of all songs, along with their difficulties and groups.

D=dance
H=hiphop
F=funk
R=rock
A=arcade
C=classical
?=secret

For Beginners (2 foot)
-(D)Trip To The Moon
-(H)Seattle's Finest
-(H)Love You Anymore
-(A)Mario 8-Bit

Very Easy (3 foot)
-(D)SkellyBones
-(D)Halcyon
-(D)Dance 2 This
-(H)Return F Superdouble

Easy (4 foot)
-(D)Soul Shift
-(D)Falling Into You
-(D)Euphoria
-(D)Terror From Beyond
-(D)Get On The Move
-(H)100 Bar Blackout
-(H)This Beat Is Fo Tha Streets
-(F)Too Tight
-(R)Stay With Me
-(R)Resistance
-(C)Moonlight Sonata

Standard (5 foot)
-(D)Contradistinction
-(D)Dendrite
-(D)Salad For Your Tuesday
-(D)Story Of Snowman
-(D)136.6
-(H)Shag
-(F)Funk In G
-(F)Cat Walk 2
-(F)Slap Guitar 2
-(A)Legend of Zelda

Tricky (6 foot)
-(D)Emotions
-(D)Massive
-(R)Until The End
-(R)For Who I am

Difficult (7 foot)
-(D)Beethoven Virus
-(D)Breaking The Common
-(D)Blank Knowing
-(A)Final Fantasy 7
-(R)Last Firstborn
-(?)Burnout
-(?)Secret Zombie Room
-(?)Fett's Vette

Very difficult (8 foot)
-(D)Life Goes On
-(A)Bubbleman
-(A)Metalman Goes Clubbing
-(A)Mega Man Dr. Wily
-(A)Crystalis - House Leaves

Challenging (9 foot)
-(D)HELLBEAT
-(A)Chrono Trigger
-(A)4f73r M3
-(C)Rondo Alla Turca

Very challenging (10 foot)
-(D)Uber Rave
-(D)Stalled Out & Sushi Bars
-(C)Caprice

For masters only (11 foot)
-(C)One Minute Waltz
-(C)Revolutionary Etude

For gurus only (12 foot)
-(C)Flight Of The Bumblebee

I think this calls for some changes.
First of all, we can drop all the song ratings down one, making Mario etc. 1 foot and FOTBB 11 foot. Why do we need the lowest rating to be 2 foot?

Also some song moving needs to be in order. For example, Stalled out and Sushi Bars is WAY easier than Uber Rave or Caprice. But I'll leave comments up to you in that regard. I'll edit the main post with whatever the general consensus seems to be.

EDIT: Life Goes On is a Dance song, not a Rock song. My mistake.
EDIT: Changed difficulty indicators to reflect new ones. Thanks Synth!