oh this's easy of sorts 8D & I will not list down what other people have already listed since it's quite obvious/boring to a certain extent
I just list those that people might know or might not know
BREAKERZ
Hikari
http://www.youtube.com/watch?v=6Awgzdk8SrE
the song means a
LOT to the guys & so do other songs in their discography but I remembered I was watching their 1st DVD BREAKERZ LIVE 2009 "WISH" in Nippon Budokan & they did this song as the 2nd last encore no.
frontman DAIGO was almost on the verge of breaking down as this's 1 song that's very touching ;___;
I was pissed at that time when someone on here who downloaded their Hikari single said that it suck & all

, well put a sock in it
Winter Bell
their 1st B-side to get a PV & the song's so touching/beautiful . It's perfect to balance off the crazy LOVE FIGHTER ~Koi no Battle~ xD
Orion
GIRL NEXT DOOR released Orion but I also like this from the guys

. Guitarist AKIHIDE is a mad genius for composing/writing such a great ballad which's taken from their FIGHTERZ album
Snow Rose
ditto on what I said about Orion
Dandelion ~Acoustic Version~
Found in their 4th single GRAND FINALE & it's so beautiful
Nanzenkai ... Nanmankai ... ~Acoustic Version~
Found in their 5th single Everlasting Luv / BAMBINO ~Bambino~ , this's a great orchestra driven no which's so different from the original
damn <3
abingdon boys school - From Dusk Till Dawn
http://www.youtube.com/watch?v=0F581DaCBVE
great song . I don't know if this can be counted as a ballad but I really like it & I think it's way better than Kimi no Uta
B'z - MY LONELY TOWN
http://www.dailymotion.com/video/xat...-town-pv_music
not sure if this can be counted as a ballad but this kick ass basically & frontman Koshi is hot X____X
flumpool
Mitsumeteitai
http://www.youtube.com/watch?v=EYO7ZNkKBQo
yeah I know alan has a song of the same title in her my life album but sorry I like flumpool's one a lot more than hers xD
the PV's very simple & conveys the message of this song very nicely
Frame
http://www.youtube.com/watch?v=Pd5JBMOra9c
this year's answer to Over the rain ~Hikari no Hashi~

. The album version's so long at almost 8 mins D: but it's still a nice no.
UVERworld - Kanashimi wa Kitto
http://www.youtube.com/watch?v=SGsVfyOjzxk
lovely ballad & frontman TAKUYA is just *_____* @_@
GIRL NEXT DOOR - Orion
http://www.youtube.com/watch?v=eGq8inl3dsw
their 1st winter ballad
too bad it's their worst charting single to date T_T
Matsushita Yuya - LAST SNOW
http://www.youtube.com/watch?v=JrQPps85960
nice ballad but he looked so much older than his actual age in the PV X_____X
he's 19 but he looks 29 in there D: thank goodness he had a makeover after he released LAST SNOW LOL
Kanjani∞ - Snow White
the best GIFT song outta the 7 songs that're scattered all over their 3 GIFT singles
helps that band members Ryo Nishikido & Shota Yasuda wrote & composed this together
KinKi Kids - Yakusoku
http://www.youtube.com/watch?v=H0FMUt5hLbE
ARASHI - Ashita no Kioku
http://www.youtube.com/watch?v=aCI9JqlN0oE
I can list somemore but I think I stop here xD