Rock veterans Status Quo are celebrating a rare milestone as they clock up 500 weeks on the Official Albums Chart today.
The band, whose hits include Rockin All Over The World and Whatever You Want, will hit the figure when the latest chart is published later today on the strength of their latest release Aquostic (Stripped Bare).
Guitarist and singer Francis Rossi, 65, said it felt "incredible" and said the band were "very proud".
Quo first charted with their fifth album Piledriver which went top five in 1973 - five years after their debut was released.
Over the years the band - which also features Rick Parfitt - have been helped by Blues For You which spent 30 weeks in the chart, and 12 Gold Bars which has notched up 48.
The band's progress towards the total has slowed in recent years with a number of their releases achieving just one, two or three weeks on the chart, but Aquostic - a collection of acoustic versions - today achieves its tenth week.
Rossi said: "To be celebrating 500 weeks in the album charts - that's almost 10 years - feels incredible. It's almost surreal that this band that we formed all those years ago could reach this point.
"It's a tangible achievement though, and a milestone we're very proud of. Aquostic (Stripped Bare) is itself our highest charting album for 18 years, and has just been certified gold - so it's not been a bad few weeks.
"I rarely believe in looking backwards though, we're by no means done yet - 2015 will be another interesting year for Quo."
Other acts which clocked up colossal levels include Pink Floyd with 968 weeks and The Beatles who have exceeded 1,300.
Quo have issued more than 30 studio albums, plus hits compilations and live releases. Coldplay recently broke through the 500 barrier on the strength of six studio albums.
Martin Talbot, chief executive of the Official Charts Company - which compiles the album chart, said: "This is a fantastic achievement by Status Quo. It is one thing to achieve a hit album, but to do so in 500 weeks, across a span of six decades, is a track record any act would be proud of. Congratulations to Francis, Rick and the boys."
The achievement puts Status Quo among a select group of only 50 acts with 500 weeks or more on the Official Albums Chart. The outfit with most weeks on chart of all is Queen, whose tally of 1,457 weeks puts them ahead of The Beatles with 1,406 weeks and Elvis Presley with 1,364 weeks, who are in second and third place.
Aquostic is the band's 31st studio album and features many of the band's biggest hits, but recorded acoustically for the first time.