I've gotten back to working my way through the rest of the list. Gonna mention the rest of the bands I liked in this post (probably need to be edited a couple of times).
Helsinki Lambda Club: "Lost in the Supermarket." I have to say I really liked this one. It totally took me back to listening to the original "Alternative" music back in the 1980's. You see, the term came from a name for the music that wasn't being played on the popular radio stations, hence, it was an "alternative" to the popular stuff. Bands like The Pixies, The Pogues, The Ramones, The Cure, original REM and U-2, The Sugar Cubes, Seven Simons, etc. Helsinki Lambda Club would fit right in with them. In fact, in my opinion, if they had played in the 40-Watt theater in Athens, GA in 1989 or had radio play on Album-88 in Atlanta in that same year, they would have been right at home.
Mardelas: "Ecripse." While it's not necessarily my cup of tea, I can recognize that they're a pretty credible metal band. The lead singer does a good job with the larger-than-life, almost operatic style that was popularized in Metal back in the 1980's with the almost exaggerated vibrato and soaring high notes. The drum and bass thump along with typical metal vibe, while the guitar gives the crunchy chords punctuated by screaming solos that you would expect to hear. I'm not really expert enough in the genre to determine if they're exceptional at it, but it definitely sounds like Metal.
Mayuko: "Cho to Ami." Balladeer. Nice voice, soothing music. Reminiscent to something like Utada Hikaru without the same level of punch. (I'm not trying to compare Mayuko to Utada, just trying to give an idea of the closest genre I could apply to the song.) I'll probably listen to more of her work to get a better idea if I like her music or not.
nananon: "Rock nananon." I actually feel kind of dirty for this one. It's the typical Japanese Idol stuff with two female singers. Music is pretty meh, but wow the two singers are adorable. I admit that, no matter how hard I resisted, I got sucked in by the cuteness. Fairly confident they weren't actually playing their guitars, though.
Rie: "Kingdom of the Sun." Aspiring guitar goddess. I think I've seen videos of hers on youtube before. Again, not my super cup of tea, but I had a college roommate that was heavily into this style of music, so I'm familiar with the genre. Rie is a very skilled guitarist.