Libera has a distinctive sound. All of its singers are boys, most with unchanged boy soprano (also known as treble) voices, with those boys in their early teens singing the lowest parts. Almost all their songs are either new compositions by Robert Prizeman or new arrangements of classical and contemporary tunes. Prizeman often composes and arranges pieces with individual soloists in mind, to emphasize the variety of characteristics and qualities in the boys' voices. His compositions blend innovative textures, meditative soloists and vibrant ecstatic chorus harmonies that stretch across the full range of the boys' range. Libera's music frequently combines elements of Gregorian chant, classical composers such as Debussy, Beethoven and Pachelbel, as well as contemporary pop and new age music. Some of their songs, such as "Sanctus", have appeared in different versions on several of their albums. Some more contemporary songs have been covered by the group, such as Enya's "Orinoco Flow".