Of the first group...

The music factory - reminds me of a load screen from an ancient DOS PC game. Very dated choice of colors and, er, "fonts".

Zoom - nice and easy to read. I still think it could use a redesign to make it more modern, but it's the best of the four.

Sunfly - horrible colors, grade school artwork, and I don't see what they'd do if there was a long song title.

Soundchoice - roman font doesn't seem like the best choice, but I'd probably consider this 2nd best.

Of the second group...

Music factory - same as first comment. And I should comment that red on blue is not a good contrast choice.

Mr Entertainer - what's more important here, their graphic or the information that it's supposed to be conveying?

Sing to the world - very plain, but at least it's clear and easy to read.

SBI - what's with the 1990's clipart collection at the bottom?