Sure to post the biggest opening sales week of the year, Taylor Swift’s fourth album “Red” is also spurring a plethora of individual track sales.

With lead single “We Are Never Ever Getting Back Together” and standout songs “Begin Again,” “Red,” “I Knew You Were Trouble” and “State of Grace” having already launched and amassed hundreds of thousands of purchases on iTunes, the big winner so far Monday is Swift’s “Everything Has Changed.”

The song, a duet with Ed Sheeran, had climbed to number four on the iTunes Singles charts by 11AM Eastern Time and was likely to go even higher as the day progressed.

Close behind thus far are “I Almost Do” (5) and “22″ (7). The latter, a Max Martin-Shellback production like “We Are Never” and “Trouble,” represents Swift’s notable foray into straight, uptempo pop on the new album.

“All Too Well,” which gives a cowriting credit to Liz Rose, who collaborated extensively with Swift on her first two albums, presently sits at number eight on iTunes.

“Treacherous,” cowritten by Semisonic’s Dan Wilson, who notably worked on Adele’s “Someone Like You” (12), “Stay Stay Stay” (15), the most “country” of the tracks on the album, Starlight (16), The Last Time (featuring Snow Patrol’s Gary Lightbody) (17), Holy Ground (18), The Lucky One (19) and “Sad Beautiful Tragic” (20) are also making debut appearances in the top 25.

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