an Entity references as follows:
Calum MacDonald (Scottish Gaelic: Calum Dòmhnallach /kalˠəm dɔ̃ːnəlˠəx/; born 12 November 1953) is a musician who was a founder member of, and percussionist in, the Scottish Celtic rock band Runrig, as well as their primary songwriter with his older brother, Rory MacDonald from 1973 to 2018. Generally, Rory wrote the melodies, and Calum the lyrics.