In 1964 Kevin founded the well known National Boys' Choir which he directed until 1987. Directorship of this choir was then taken over by his son Peter.

International touring choirs under Kevin's directorship have visited the Philippines, Hong Kong, Japan, Taiwan and Canada.

In 1984 Kevin expanded his choral activities by establishing the National Girls' Choir. The later addition of a boys' choir and older group saw the need for a name change and so The Choral Institute Melbourne (CHIME Choir) was born.

Kevin Casey's own involvement in singing consists of many ABC recitals, Oratorios and Operas with ABC Television and the Melbourne Symphony Orchestra. Kevin Casey is widely sought after as an adjudicator for Eisteddfods.

Kevin retired as Artistic Director of CHIME in 2002.