They will push notes up and down to make them sound more "right" in the immediate context. Not all of the stringed players. One of the harder things on violin

They will push notes up and down to make them sound more "right" in the immediate context. Not all of the stringed players. One of the harder things on violin for me, after years of fretted instruments, is still intonation. Makes a mandolin seem like a push-button version of a violin. (We will save that infernal stick-and-horsehair thing for another discussion.) The flip side is that when the mandolin gets out of tune (and oh, it does), you just have to live with it until the next opportunity to fire up the tuner.