Barlow's Decca-issued commemorative track Sing, written with Andrew Lloyd Webber, is on course to climb from 11-1 on the singles countdown having already sold nearly 90,000 copies this week by the close of business on Tuesday, according to the Official Charts Company.
The accompanying album, also called Sing, debuted at number one last Sunday and should easily claim a second week at the top this coming Sunday having in the week so far outsold its nearest six challengers combined.
The Barlow and Commonwealth Band single and album are accompanied in both markets by a number of releases that are enjoying big surges in sales thanks to the Diamond Jubilee concert that took place in front of Buckingham Palace on Monday evening.
Asylum/Atlantic act Ed Sheeran's + moves 13-2 on midweek artist albums with sales rising 248% week-on-week following his performance at the concert, while the track he played The A Team rebounds 118-41 on singles with sales up 539%.
Other tracks making a big impact on the singles market after featuring in the concert include Parlophone act Lady Antebellum's Need You Now which returns in 26th place after being covered at the event by Gary Barlow and Cheryl Cole, Motown artist Stevie Wonder's Superstition in 44th place and the Union Square-issued It Must Be Love by Madness who performed the song on the roof of Buckingham Palace.
The albums market is also being influenced by the concert with Island/Lava's Jessie J album Who You Are's sales more than doubling to lift it 20-9, while Decca act Alfie Boe's Bring Him Home leaps 159-57 in the week so far and Stevie Wonder's Motown-issued The Definitive Collection and the Union Square album Total Madness appear in 60th and 61st places respectively.
The Diamond Jubilee affect comes in another very busy week for album releases with a dozen brand new titles cropping up in the Top 40 at this stage of the week. They are led in eighth place by the Reprise/Warner Bros-issued Americana by Neil Young & Crazy Horse and a Sony re-issue of Paul Simon's Graceland in 10th spot, while One Day I'm Going To Soar, the first studio album from who are now known as Dexys since 1985, is 12th. The album has been issued by BMG Rights, which will give the company its biggest hit yet on the countdown.
Also on the comeback trail, the Beach Boys are back with their first studio album of new material since 1992. The Capitol/Parlophone-issued That's Why God Made The Radio crops up as a new entry at 13 on the midweeks, a place ahead of RCA act Alexandra Burke's brand new album Heartbreak On Hold, while EMI's new Kylie Minogue retrospective The Best Of is new at 16 and B-Unique/Polydor's Souvenir - The Singles 2004-2012 new at 17.
An EP by The Voice runner-up Bo Bruce called Search The Night is new at 19, while an EMI re-issue of David Bowie's The Rise And Fall Of Ziggy Stardust And The Spiders From Mars is new at 24. Also showing up within the Top 40 are brand new albums from Modular/Island's Ladyhawke, Columbia's Patti Smith and Roadrunner's Delain.
Within the Top 10 at this stage of the week RCA's Paloma Faith drops 2-3 with Fall To Grace, Parlophone's Mylo Xyloto climbs 11-4, Rumer's second Atlantic album Boys Don't Cry slips 3-5 and Virgin act Emeli Sande holds at six with Our Version Of Events as the Bee Gees Reprise/Rhino retrospective Number Ones remains seventh.
The full midweek singles and albums charts are on musicweek.com.