How often should I change the strings on my guitar to ensure optimal sound quality and playability? Is there a definitive guideline that takes into account various factors such as frequency of use, the type of strings employed, and the specific genre of music I typically play? For instance, do electric guitarists require more frequent changes compared to acoustic players, given the differences in string composition and tonal range? Furthermore, how does my playing style influence the longevity of the strings? If I play daily or engage in extensive practice sessions, should I expect to replace them more often than a casual player who only strums occasionally? Additionally, are there particular signs or symptoms that might indicate the strings have reached the end of their usability, such as a dull sound, loss of sustain, or visible wear? What best practices can I adopt to extend their lifespan without compromising sound quality?