Microphone sensitivity is crucial for karaoke as it determines the microphone's ability to capture and reproduce your voice accurately. A high-sensitivity microphone will pick up even the softest vocals, effectively converting acoustic sound into an electrical signal. This results in a clearer and more precise sound quality. However, too much sensitivity might also capture unwanted background noise. So, balance is key. Select a microphone with appropriate sensitivity for a successful karaoke session to present your singing prowess faithfully.