Sinking Ships is one of my favorite songs too, but I haven't really gotten into any of FritzyBeat's other music. Never heard of Turquoise Splash before, pretty good. That third song reminds me of a really good fanfic I read about Mr. and Mrs. Cake's life.
Anyway, I'd list Aviators and AllLevelsAtOnce with my favorite artists, but all their songs I like the best aren't pony songs. So instead I'll say Tarby, BlackGryph0n & Baasik, AcoustiMandoBrony, and probably my absolute favorite being Ponyphonic.
Ponyphonic has released very few songs but they're all amazingly put together. My favorite among them being Harmony Ascendant
. It's like an epic fantasy saga and/or origin story in a six minute song.
Tarby doesn't seem to be quite as good live as he is in a studio, but I like him anyway. He covers some rock genres I like that no one else seems to be doing, at least not nearly as well in my opinion. The songs I like best of his are Nightmare Moon
and The Night Will Last Forever
. One embodies the character really well and the other is a fun reinterpretation the infamous line.
BlackGryph0n and Baasik have great vocals, instrumentals, and some cool mixing effects in their songs. It took a while to narrow down but I think my favorites are Quest (This Can't Be All)
and Faster Than You Know
Finally as for AcoustiMandoBrony, My favorites would be Loyalty
. Even though Rainbow Dash and Fluttershy are really not my favorites, they nailed those two songs. I also really like A Long Way From Equestria
. It reminds me of Journey's Don't Stop Believing with the male and female characters and the general tone.