Just a few minutes ago, I finished up writing the article on Superfly's "Beautiful" since the performance of that song on last year's Kohaku Utagassen was one of the high points for the broadcast for me.
I could say the same thing for a band that also made its first presence on the show. However, as soon as I saw the original kanji for this group from Western Japan and the Kanto, I just thought, "Yep, that's eclectic...that's properly eclectic." To be honest, I didn't even know to how say it until I looked it up on Wiki. But it was a string of kanji that I had seen a few times before but never got to hear until Kohaku time.
It doesn't happen all the time but sometimes I feel that a Kohaku performance by a singer or a group is fine but not the best. I got that impression from Gesu no Kiwami Otome（ゲスの極み乙女。）when they did "Watashi Igai Watashi ja nai no" (Not A Me Other Than Me). Basically as the song title implies, I discovered a tune that wasn't quite that tune when I first heard it on the Shibuya stage on December 31st. However, I could feel that this was a good tune.
Thankfully, I was able to find the original music video for "Watashi Igai Watashi ja nai no" which was released in April 2015 as Gesu no Kiwami Otome's 2nd single. For the band's J-Wiki entry, I read a whole shopping list of musical genres that they include: rock, jazz-rock, progressive rock, post-rock, math rock, indie rock, experimental rock. More rock in there than in a small hunk of granite but I think "Watashi Igai Watashi ja nai no" isn't so much rock but some nice and healthy eclectic pop. I like the rolling piano along with the indie-ish of it all with spurts of fusion and some pure jazz. There's nothing I appreciate more than a tune that masterfully blends disparate genres into a wonderful whole.
"Watashi Igai Watashi ja nai no" hit No. 11 on Oricon and earned a prize for either Best Song or Best Composition at the Japan Music Awards last year. The song, by the way, was written and composed by Gesu no Kiwami Otome's main songwriter and vocalist Enon Kawatani（川谷絵音）. The other band members are Kyujitsu Kacho（休日課長）on bass, Chan Mari （ちゃんMARI）on keyboards and Hona Ikoka（ほな・いこか）on drums. From what I've read on their Wikipedia page, most of them have positions in other bands as well.
Ah, before I forget, the song was also used in a Coca-Cola campaign.