PORT TOWNSEND — The Spring Sing, a concert and sing-along to benefit the Jumping Mouse Children’s Center in Port Townsend, will welcome all voices to the Cotton Building, 607 Water St., this Saturday night.

The PT Songlines Choir is to be host of the 7 p.m. gathering, in which the audience joins in easy-to-learn songs, becoming an “insta-choir,” as codirector Gretchen Sleicher calls it.

Saturday’s concert is about “experiencing the joy of collective harmony-making,” she said, adding that the PT Songlines repertoire for this season includes Sting’s “Love Is the Seventh Wave,” along with a mix of songs from right here ­— composed by codirector Laurence Cole — and from as far away as South Africa.

Admission to the Spring Sing is a suggested $12 donation, or “more if you can, less if you can’t,” Sleicher said. Proceeds will benefit Jumping Mouse, which provides mental health therapy to children, particularly those who have experienced trauma, domestic violence or are grieving the loss of someone close to them.

PT Songlines seeks to support Jumping Mouse, Sleicher noted, as it serves children regardless of their families’ ability to pay.

A community choir that requires no auditions, PT Songlines is in its eighth year. For more information, look up PT Songlines on Facebook or phone 360-643-1595.