I got this email that I thought I could share with you lot.
To get the 3 free songs you need to have a Rockstar Social Club Account (free)
Then you need to link it to either any of these three
XBOX LIVE gamertag
Games for Windows
Once you have linked it to one of those 3 and you subscribe to their mailing list, you should get a unique code where you can download the GTAIV soundtracks.
To celebrate this week's launch of Grand Theft Auto IV: The Lost and Damned, the first episode of Grand Theft Auto IV downloadable content on Xbox LIVE®, we are offering select Social Club members three free songs off the newly launched Grand Theft Auto IV soundtrack on iTunes.
Use your unique code below to download the following three soundtrack songs on iTunes:
Skyzoo "The Chase Is On"
Drive By Audio "Jailbat"
Your unique code is: MANFYNTA9R7E
Click here to redeem your free downloads with this code at iTunes