The RCC Auditorium is a flexible intimate black-box space with great sound and acoustics, which seats 146 and can accommodate 240 standing. The Centre presents a select programme of local, national and international classical, jazz, traditional, world music concerts and youth rock gigs each year.

Concerts are presented in association with a range of partners including Earagail Arts Festival, Music Network, Colaiste Ailaigh (BEO), Donegal Chamber Music Society, Donegal Youth Services, Comhaltas Ceoltoiri Eireann, and others. The RCC is committed to music development and works in partnership with the ETB Donegal Music Education Partnership that is based in the building. As a result the RCC is home to the Donegal Youth Orchestra, Donegal Chamber Orchestra, Errigal Groove Orchestra, Junior and Youth Choirs and Errigal Singers. The music programme includes three major annual festivals, Letterkenny Trad Week in January, Distorted Perspectives on the May Bank Holiday Weekend and Donegal International Folk & Roots Weekend as part of the Earagail Arts Festival in July.