One of them, Ruby, who had also had a number of collaborators, saw a strong compatibility between the two, and by 1920, Kalmar and Ruby recognized that they should form a permanent songwriting team.
Ruby | Ruby (programming language) | Kalmar | Ruby Dee | Ruby on Rails | Kalmar Union | Jack Ruby | ruby | Ruby Wax | Pokémon Ruby and Sapphire | Ruby Vroom | Ruby Turner | Ruby Ridge | ''Pokémon Ruby'' and ''Sapphire'' | Kalmar FF | Kalmar County | Carlos Kalmar | Shenzhen Ruby F.C. | Ruby Murray | Ruby-crowned Kinglet | Ruby Braff | The Tale of Ruby Rose | Ruby Walsh | Ruby-Spears | Ruby Records | Ruby Payne-Scott | Ruby Laffoon | Ruby Junction / East 197th Avenue | Ruby, Gold and Malachite | Ruby character |