Absolutely love the use of color and imagery in Entry #28. We do not, however, use records or discs anymore. Could you incorporate something else to replace the record in your design (anything other piece of equipment that a DJ might use).
Currently Entry #31 is one of my two favorites. Please change the slogan on the bottom to "Mobile DJ Entertainment and Much, Much More!" and send the new logo before the contest ends. Thank you.
Entry #57 is very clever. I like it but I think I still like Entry #55 more. I am not sure that a city landscape is right for my company. If somehow you could change the city landscape into the frequency bars that you used in your other designs it might be better for my industry.