Harpenden Barbershop Harmony Club (HBHC) is inviting new members to join by posting 15,000 flyers through letterboxes in Herts.
Perfoming as 'The King of Herts', the club has been entertaining audiences in the county since the 1980s.
Chair Mike Rose, who joined after a similar recruitment campaign in 2015, said: "The flyer is encouraging everyone to attend a free six-week course with the intention of singing four-part harmony with a smile on your face.
"The course is for unaccompanied four-part a cappella singing - but it’s not as challenging as it sounds! I joined as a complete novice and it was one of the best decisions I’ve made.
"The emphasis is on enjoyment both in learning and public performance of popular songs, with the friendliest bunch of singers you could hope to meet!
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"Some members do read music but that is not a requirement."
The club, which meets at the Wood End Junior School, has historically been a male voice chorus but recently welcomed women as members.
Get-togethers start on Thursday, October 26 and continue until an end-of-course concert on November 30, to which attendees' family and friends are invited.
Anyone interested in getting involved can get in touch by emailing info@kingsofherts.co.uk.
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