Promising bands that have traveled down the ol' dirty shit road? Let's see...
BYEE the ROUND...
I first heard their debut album in 2007, "give me a chocolate" which was an amazingly aggressive indie-rock record. Instrumentally talented with a vocalist that actually sounded masculine (which isn't common amongst all of the high=pitched, effeminate vocalists you hear in Japanese indie-rock). Their second album was a mess and their 3rd was actually fairly redeeming, but after that, they went major and signed with sony. Everything went straight down hill from there. Their sound has been streamlined and tailored to appeal to the mainstream/pop audience. That's like trying to taking a lion out of the wild and trying to domesticate it. Sadly, this happens far too often with indie bands.
0.8秒と衝撃。...
First heard them in 2009 with their "POSTMAN JOHN" single. My initial thoughts were that this group was spiffy. On their subsequent releases, my thoughts went from "just spiffy" to "wow, these guys are actually pretty rad and original". Unfortunately however, the novelty of this band's sound wore off pretty quickly. Even if your formula is original, if you don't implement any fresh ideas, you're likely to go stale sooner or later. Oh well...
sleepy.ab...
These dudes were once considered Japan's answer to Radiohead, but unlike Radiohead, they haven't been able to maintain the quality of their music. Their first 4 albums were really great (which is a nice feat in itself), but mostly everything after 2007's "Fantasia" is one big sappy MEH-fest. Which is ironic because these guys once excelled at making sappy music that still managed to be compelling...now it's just....sappy. And boring.
9mm Parabellum Bullet...
Ok, Ok. 9mm hasn't gone to complete shit. In fact, I still keep up with their work. These guys are an odd case, though. They went major in 2007, their first full album was released through SONY, and I consider it a Japanese rock classic. So I can't exactly argue that going major had anything to do with the decline in their sound. But after the first, they've had a slow, but steady decrease in quality. Thankfully, they seemed to have plateaued at the "above-average mainstream rock-band" marker and haven't dropped any further. Still, I had to list them here because they were once something much more special I think.