Is a harmonica a big part of bluegrass?

While the harmonica is not a central instrument in bluegrass music, it can occasionally be featured in some bluegrass bands and songs. The genre primarily relies on instruments like the banjo, mandolin, fiddle, guitar, and upright bass. The harmonica may add a unique flavor or texture when used, but it is not a defining element of traditional bluegrass. Overall, it plays a minor role compared to the core instruments of the genre.