The album in question is Lungs, the debut collection from Florence & The Machine, which tops the chart for the first time, on its 28th appearance on the list.
The album opened its account last July, spending its first five weeks at number two behind The Essential Michael Jackson before retreating. It fell as low at number 39 but returned to number two last week, buoyed by the success of You Got The Love and Dog Days Are Over.
The album - which sold 51,005 copies last week to lift its career sales to 611,470 - spent longer at number two before getting to number one than any other album thus far in the 21st century, though five albums which reached number one have spent longer at number two, with The Kings Of Leon's Only By The Night topping the list with 11 weeks as runner-up.
To reach number one, Lungs had to survive a vampire attack - in initial mid-week sales flashes it was trailing behind Contra, the second album by New York's indie rockers Vampire Weekend.
Contra weakened throughout the week, and debuts at number three on sales of 42,806 copies, also falling behind Paolo Nutini's Sunny Side Up, which dips 1-2 (49,557 sales). Vampire Weekend's self-titled debut entered the chart at number 22 (7,246 sales) in February 2008, and peaked at number 15 some 16 weeks later. It has sold 289,279 copies to date.
Also new to the Top 10 are Hold Me Down by You Me At Six (number five, 20,193 sales) and Acolyte, the debut album by Manchester's Delphic (number eight, 18,097 sales).
Weybridge band You Me At Six's only previous album, Take Off Your Colours reached number 25 on indie label Slam Dunk in 2008, selling 33,640 copies, and was reissued by their current label Virgin in a deluxe edition last autumn, charting at number 61 and selling a further 15,527 copies.
Album sales decline for the third week in a row, falling 1.3% week-on-week to 1,974,131. That's 7.65% below same week 2009 sales of 1,833,840.
Meanwhile, Iyaz's Replay continues atop the singles chart for a second week. Though its sales fall 18.3% to 86,814, it easily has the beating of Owl City's Fireflies.
The latter track, a recent US number one, debuted last week at number 50, its release brought forward a couple of days to combat the threat of a soundalike cover version that was doing well on iTunes. In its first full week, Fireflies sold 59,235 copies and vaults to number two, pushing Sidney Samson's Riverside (Let's Go) back to third slot (58,485 sales).
For the first time since Alexandra Burke and Jeff Buckley's versions of Leonard Cohen's Hallelujah held the top two slots in the chart a little over a year ago, there are two versions of the same song in the Top 10.
Like the Burke/Buckley fight, the simultaneous presence of two versions of Don't Stop Believin' in the Top 10 is at least partly due to The X Factor.
Journey's original version of the song, a minor 1982 hit, was catapulted into the Top 10 after being covered by Joe McElderry on The X Factor a few weeks ago, and it has now been joined in the top tier by the Glee Cast recording of the song - one of seven new entries into the Top 200 by tracks from the new E4 comedy/musical/drama series Glee.
Journey's recording holds at number six on its sixth week in the Top 10 (38,979 sales), while the Glee Cast version jumps 99-5 (39,174 sales). Journey's track has now sold 396,794 downloads since OCC started tracking digital sales in 2004, and moves to the top of the list of biggest-selling downloads of songs released before 2000, replacing The Pogues & Kirsty MacColl's 1987 recording, The Fairytale Of New York, which has just finished its latest chart run, and has sold 364,438 copies digitally.
Glee has been a huge success wherever shown, and its E4 screenings here will be followed by Channel 4 Sunday repeats, so most tracks will receive a second boost.
We are likely to see the songs make the same mass invasion of the charts here as they have elsewhere - in 2009, 20 songs credited to the Glee Cast charted in Australia, 23 made the Canadian chart and 25 made it into the US Hot 100.
Apart from Don't Stop Believin', Glee Cast chart entries here this week are: Take A Bow (number 43, 7,350 sales), Gold Digger (number 49, 6,286 sales), Rehab (number 62, 4,684 sales), On My Own (number 73, 4,090 sales), Push It (number 115, 2,603 sales) and Can't Fight This Feeling (number 117, 2,529 sales) - covers of hits originally performed by Rihanna, KanYe West & Jamie Foxx, Amy Winehouse, The Les Miserables Cast, Salt 'N' Pepa and REO Speedwagon, respectively.
Singles sales slipped 4.34% last week to 3,143,555 - 17.40% above same week 2009 sales of 2,677,572.