Calluna is a serif font. It goes well with JAF Facit, Source Sans, Brandon Text, Sero, GT Walsheim, Apercu, Calluna Sans, Proxima Nova, Circular and Tungsten. If you're thinking about using Calluna then try 16px for headers. Give 20px a shot for content.
People commonly tag it as writing, magazine, design, finance, portfolio, blog, illustration, sans serif, layers and music. You can get it from Font Squirrel, Fontdeck, Fonts.com, Fontshop, Fontspring, MyFonts and Typekit.