Sometimes, this can improve the sound quality in a way that it gives “personality” to the headphone (think of the bass in Beats headphones). Other times it can amplify muddiness or harshness that wasn’t intended by the audio engineer or artist. This is why most producers, artists, and engineers usually lean toward a more tame frequency response curve.The best headphones for music creation/monitoring have mostly flat frequency response curves to get the most accurate reproduction of the original intended sound. While this can be great for its purpose, not all headphone users are recording artists or producers. This is why there isn’t an overall “best” frequency curve for headphones - it all just depends on what you are using them for.As recording technologies become more affordable and portable over time, artists have been more frequently using “mobile studios” record demos and samples in different environments.A few examples are Andrew Huang, Lights, and Ninajirachi, but there are plenty of other artists who go “sample hunting” for unique samples to bring home and produce with.