About music being so depressing, since when hasn't most music been depressing? :D I guess it's up to you to decide what's depressing. Personally I don't consider "happy" music about partying worth my time. Then again there's also political songs, but they tend to be kind of a downer as well (duh...). What exactly do you want to see more of? "Sabbra Cadabra" kind of happy or "Rock n Roll All Nite" kind of happy? ^^ To me, a song like "Us and Them" for example isn't depressing just because it deals with issues. I don't know your opinion on that, but I do know most people would say it feels depressing. For me a song has to be pitch-black, meaning it has to have as a theme that there is no way out, to be depressing. Take "Goodbye Cruel World" as an example, that's a depressing song. Is "Mother" a depressing song? Not really, it's sad but there is always that silver lining of hope connected to breaking free from it all.
This genre however, "Etheral Wave", seems to focus on moody atmospheres, so it all seems to be "depressing" or at least "sad" I guess.
Oh and btw, some fresh happy music of today! Enjoy!: http://www.youtube.com/watch?v=QJO3ROT-A4E