The Oceanic Six

...aaaand Ministry of Magic (affectionately named MOM)

The common denominator in most of these bands (with exception to Skyway Flyer which is Jason's artist name), would be Luke. So, I guess you could say Luke Conard is my favorite artist but Kristina Horner is pretty awesome too and so is Jason Munday...so I think the final solution will be to say Ministry of Magic is my favorite band because I love Harry Potter, I love their music, both Luke and Jason are in the band (with several other very talented peoples), and Kristina sings some of their songs with them. Although the same could be said about Oceanic Six because all of the above is relevant there too...but I like Harry Potter more than I like LOST so... there ya go! :)