Oliver's shows include Jasper in Deadland, We Foxes, Mrs Sharp and 35MM: A Musical Exhibition and he will be travelling to London to host the concert.
Williams, who originated the role of Truly Scrumptious in the world premiere of Chitty Chitty Bang Bang at the London Palladium and has also been Olivier nominated for Howard Goodall's Love Story, was most recently seen on the musical stage in a tour of Annie Get Your Gun.
Noblezada was discovered by New York casting director Tara Rubin during the Jimmy Awards, a high-school musical theatre competition, and subsequently cast as Kim in the London return of Miss Saigon, now at the Prince Edward, which marks her professional and West End theatre debut.
Boys rose to prominence in the BBC show "Any Dream Will Do". West End shows since include Spamalot and Avenue Q. Last year Daniel became the new voice of the iconic theme tune for the Australian soap "Neighbours."
Zetterholm played the title role in the German production of Tarzan after winning a German reality show " Ich Tarzan." Other roles have included Fiyero in Wicked and recently Enjolras in the West End production of Les Miserables. The concert will be directed by Katie Pesskin. with musical direction by Michael Riley. The concert is produced by Susan Winter and Katie Pesskin for As Told By Productions.
To book tickets for RSO in London – The Music & Lyrics of Ryan Scott Oliver, contact the box office on 0844 264 2140, or visit www.stjamestheatre.co.uk