Mei Lin's first side project was the Boston Ravine Bluegrass Band, formed in 2018 in Grass Valley, CA. The town was once known as Boston Ravine. The group includes her father, Robert Heirendt (guitar, vocals), Mei Lin Heirendt (fiddle, mandolin, vocals), and Karl Chelette (bass). Steeped in traditional bluegrass, the band also brings their own interpretations of contemporary bluegrass, country, and gospel into their mix.