How to transfer music off of a free music app on iphone to a laptop?

Okay, so on my iPhone 4, I have an app called iDownloads Plus. I would love to keep it on my iPhone and everything,(its great and all) but it takes up over 3gb of space! So I can't even download barely any other apps. I have about 600 songs on the app, and I don't know how to transfer the songs to my laptop without downloading anything to do so. Do any of you know how to transfer the songs off the app to my music library on my laptop without having to install anything on to my laptop, or having to buy anything? Please help! I don't want to have to delete all of the songs that took forever to download.

Well I definitely don't know how to transfer it (although i have that app) but if all else fails download mp3 rocket to your computer, second best free music downloader to ever walk the Internet.

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