In 1995 he served on the Commission responsible for establishing a new South African National Anthem. The new Anthem is a combination of Enoch Sontonga’s well-known “N’kosi Sikeleli Africa” and of the erstwhile Anthem, “Die Stem van Suid-Afrika”. The latter, as a matter of historical interest, was composed by Johan’s grandfather, M.L. de Villiers, in 1920.
Johan has conducted the Libertas Choir, together with various orchestras, in several performances of major oratorios. He regularly acts as adjudicator at choir festivals and Eisteddfods. In 2010 and 2018 he received official recognition from, respectively, the society of alumni of Stellenbosch University, the Convocation, and the club of ex-chairmen of the student council of Stellenbosch University, for his contribution towards the promotion of choral music. In addition, he was a recipient in 2015 of a special medal of honour awarded by die South African Academy for Science and Art.