Why would I sing Ayumi songs? I sing SUPERCAR and SPITZ.
But an easy song to sing is No more words. evolution is hard!

No one asked if you did or not. o_o?

It's about which one is in general.. o_o;

Well, one would figure that if the question is "Which song is easy/hard to sing?" that the people answering have in fact attempted to sing the songs or sing them often.

Easiest~
Moments
HEAVEN
STEP you
my name's WOMEN
fairyland
Bold & Delicious
INSPIRE
RAINBOW

Hardest~
HAPPY ENDING
About You
Will
Fly high
I am...

~Easiest
both Hanabies
Heartplace
Voyage
No way to say
Winding Road

~Hardest
Naturally
Game

I always thought evolution was pretty hard to sing, since she's singing kind of fast, I always get all tongue-tied.
I know that the easiest song for me to sing is Dearest since I already have most of it memorized anyways...

There's others that i'm okay (can follow the lyrics fairly well with few mistakes) at but I can't think of them at this moment.

lol, when i try to sing About You, i get all "hdgoa;fgukl;ahukl"-ish. lol.

^That sounds interesting, you should record some for us :D.

It'll be a whole new take on Ayus music and you will rock the world with instant fame :yes.

Hard for me:
Evolution is easy to sing except for the WOW~ Yeah parts.
M: The high-pitched parts at the end.
Seasons: Again, high-pitched parts in the chorus.
Moments: Once again, the chorus
Independent: I run out of breath when I reach the chorus
Game: Hard in general
Because of You
You

Easy for me:
Greatful Days
Alterna
Carols: I had a hard time at first, but I got over it.
Walking Proud
Depend on You
Real Me
Fairyland
Far Away
Dearest
Appears
Ever Free
Dolls
Step You
Heaven
Voyage
Hanabi

Not the same for me, I think INSPIRE very difficult to sing, it is quite fast. I find the chorus quite hard.
Moments may be easy, kanjis are not so hard but the beginning may be the hardest, after "lalala" part, I don't have breath anymore to sing :"kokoro ga ...." furthermore there are consecutives syllabs with "k" family kana, hard to say for me.

The easiest ones for me are Dearest, A Song for XX, SEASONS, kanjis are not so hard and it's slow songs.

Fly high is definitvely difficult at the beginning with very high tempo (like rap)

Nice topic...

Easy and comfortable songs off the top of my head are ballads..

Moments (the verses are the best part)
HEAVEN
rainy day
HANABI (!!)
forgiveness
walking proud
SEASONS

These songs are also nice to adlib on and I usually catch myself doing a different harmony to the song as well.

Don't get me started on the hard songs, though. Yeah, I know the lyrics and can sing them but it sounding GOOD is another story lmao.

Actually I'm confused with this... Do you mean Ayu's songs that we can sing but we dunno if people consider them sound good or not when we sing it, or the songs that sound good when we sing it?
Coz to me,
Easiest songs to be sung r:
-STEP you
-Who...
-LOVE~Destiny~
-theme of a-nation '03
-TO BE
-HEAVEN
-fairyland
-rainy day
-RAINBOW
-A Song for XX
-Beautiful Fighters
-BLUE BIRD
-Now way to say
-SEASONS
but I dunno if people will consider it sounds good if they listen to it... But I think I can sing them...
Anyway my friends said it was good when I sang Who..., Fly High, Boys & Girls, LOVE~Destiny~, Beautiful Fighters and Ladies Night (The rap part only)

Hardest are:
-evolution
-Pride
-Depend on you
-Trust
-Startin'

i have had 3 yrs. of vocal training w/ one teacher and now i've got a new voice teacher cuz i'm in college minoring in vocal performance... i'm not tryin to brag or anything... just lettin yall kno where i stand singing-wise...
anywayz... evolution is kinda hard to sing cuz of the lyrics and itz kinda fast...
and alot of Ayu's songs are in a weird place in my voice. but thatz kinda good cuz it strengthens and gives me good practice on transitioning from chest to head voice... i like singing her low stuff best tho...

Easiest songs for me:
Seasons, evolution, forgiveness, walking proud...

Hardest songs:
M (there's no way I would reach the notes in the final chorus)
Unite
A song is born

Best :

- A Song For xx
- appears
- Seasons
- I am...
- M
- Dearest
- Heartplace
- Close To You
- Because of You
- No Way To Say
- About You
- GAME
- Carols
- Bold & Delicious
- Fairyland

Worst :
- Fly High
- End of the world
- evolution
- Real Me
- Free & Easy
- Rainbow
- Angel'Song
- in the corner

easiest would have to be heaven, i sang it to myself randomly and relised i already know half of it! and i don't even know any japanese

Easiest:
A Song for XX
Beautiful Fighters
GAME
Replace
Trauma
my name's WOMAN

Hardest:
All the rest
XD
Just kidding:
M (I can't sing the 'MARIA' part to save my life)
INSPIRE (My voice is too damn deep to sing low in the verse then high in the chorus X_X)
evolution (Too fast)
Ladies Night (Verse is too fast)
fairyland (Just can't sing it :()

Don´t be mad with me...I can sing along with all Ayu Songs I like (not perfectly when I never saw the lyrics but I´m close XD)

Bút I can´t sing songs I can´t stand like WHATEVER XD I´m pretty good at fast upbeats like Trauma Startin & evolution XD (and I said I just sing along....I think nobody will stand my voice XD)