How to recover deleted songs off of my iPhone?

I downloaded the app ring.tones off of the app store on my iPhone 4s, and in the process I had to download the ringtone to my computer and back onto my iPhone for it to work. After I did this, and downloaded the ring tone to my iTunes and dragged it onto my iPhone, and somewhere during this all of my songs got deleted off of my iPhone. All of the songs are still on my iTunes music library, but there are hundreds of songs that are on my music library that I didn't want on my phone because they are my siblings, and their iPhones/iPods are just hooked up to the same computer. Anyways, is there anyway to undo this process and somehow get all of my music/playlists back onto my phone without having to manually drag them all back on?

Connect iPhone to computer, and then open "Computer", iPhone should show as a drive letter there. If not, please follow these instructions: In iTunes, right click on your iPhone and select "iPhone Options". Under the "iPhone" tab, make a tick in "Enable Disk Use". Click OK. Unplug your iPhone, then replug.

Now follow steps below
Step1: Download this data recovery software, then install and launch it in Windows machine correctly.
http://www.google.com/...oA&cad=rja
Step2: Sync your iPhone with computer. Then you should see it shows as a drive letter in 'My Computer' like H:/.
Step3: Select iPhone drive letter and then click "Next", you will find all your lost files in the lists.
Step4: After the automatic scanning, it's time to finish all the steps by clicking "Recover" easily to Recover your files!

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