Tagline and Vocal Dimension will sing at St Barnabas Church, Pitshanger Lane , on February 14 for a special Valentine’s Night concert organised by Ealing choir Capital Chorus, who will also perform.
Vocal Dimension are a gold-medal winning all-female chorus from Surrey, while Tagline were crowned Britain's champion male barbershop quartet in 2015.
Pippa Goodall, Capital Chorus director, said: “We're so excited to be performing alongside two of the country's most successful singing groups.
“Vocal Dimension and Tagline are an inspiration. Like us, they're regular people with regular jobs, whose dedication has helped them to bring their musical talent to the fore.
“We're all looking forward to a very entertaining and memorable evening.”
'A huge deal'
Capital Chorus themselves are a former winner of Britain's best small Barbershop chorus but this is the first time they have attracted such a high calibre of singers to perform at one of their shows.
For both Tagline and Vocal Dimension, the west London performance will act as part of their preparation for the world championship singing competitions in the United States later this year.
Quartet Tagline, a group of former students at Manchester University, will represent the UK in the international men's barbershop quartet competition in Nashville in July.
While Vocal Dimension have earned a spot in a worldwide women's chorus contest at the MGM Grand Hotel and Casino in Las Vegas.
John Beesley, of Capital Chorus, is hoping that this can lead to even bigger and better things for the group.
He said: "This is a huge deal for us, these guys are some of the best in the business and have been recognised as such.
"Both these groups are gold medal winners, Tagline are considered the best in the UK, while Vocal Dimension have such an impressive range it will be an honour to sing alongside them.
"We have never managed to attract acts with such a high calibre previously, so hopefully it is a sign of things to come.
"If this goes well we are hoping to attract more huge acts and put on bigger and better shows in the future."
Tickets cost £15, concessions £12 and are available on the door or in advance by emailing firstname.lastname@example.org .