So open DNS did not do the trick for me, however I am still using it now. I instead went over to
Tor: anonymity online and downloaded their package for windows. After doing that I am now able to access mp3 sparks. So just for the record I am using open DNS along with tor.
I live in San Diego California with cox service provider. I called just to make sure they were not filtering the site. I told the technician that I couldn't log onto mp3sparks.com and he said it was loading fine on his end. They also said that they are currently not filtering any websites. I don't know how true this was but they did tell me what artists were on the front page of sparks right now.
One quick note for firefox users that choose to use tor. When firefox is loaded you will find the open proxy settings under:
tools/options,
click the advanced button,
then click on the network tab,
followed by the settings button.
The window that pops up is where you set your proxy IP number to use.
Hopes this help