Serato DJ has just released a public Beta of their software which includes the integration of Pulselocker. Pulselocker is basically a music streaming service that seem like it will give you access to a big library of music to play from your DJ software. As mentioned in the press release you will get access to about 44 million tracks(who knew there was the much tracks out here). Although not mentioned, I suspect there will be bug fixes too.
Unfortunately, if you are looking to try out the Pulselocker feature, only three countries are currently available: US, UK and Canada.
Check out the link here for access to the