The Digital Songs or Digital Song Sales chart (previously named Hot Digital Songs)[1] ranks the best-selling digital songs in the United States, as compiled by Nielsen SoundScan and published by Billboard magazine. Although it originally started tracking song sales the week of October 30, 2004,[2] it officially debuted in the issue dated January 22, 2005, and merged all versions of a song sold from digital music distributors.[3] Its data was incorporated in the Hot 100 three weeks later.