Music plays a central role in the programming at the Gate House Theatre. The venue regularly hosts live concerts that span a wide range of genres, from folk and country to rock, jazz, and classical music. Due to its small size, performances are often acoustic or involve minimal amplification, allowing the natural acoustics of the space to shine. This gives concerts a personal, immersive quality.

Local musicians are frequently featured, allowing them to share their talent with the community and gain exposure. The theatre also invites touring artists, providing Port McNeill residents the opportunity to experience diverse musical styles without having to travel to larger cities. In the past, the theatre has hosted performances from solo singer-songwriters, small bands, and even youth music programs, showcasing the area's musical diversity.

The Gate House Theatre is not only a venue but also a catalyst for the arts in Port McNeill, helping to foster a sense of community around the love of music and live performances.