This blog post explores the nuances of generating musical notes using the Raspberry Pi Pico's PWM capabilities. Unlike simpler platforms where frequency can be set directly, the Pico requires a deeper understanding of PWM implementation and the use of lower-level APIs. The article explains how PWM works on the Pico, emphasizing the role of the counter, input, and duty cycle. It discusses the limitations of the Pico's native frequency range and introduces the clock divider feature for expanding the range. The post provides practical code examples in Rust using the rp-hal library, illustrating how to calculate note frequencies and play a simple melody like "Twinkle Twinkle Little Star." This guide is valuable for developers transitioning from MicroPython or Arduino and seeking to utilize the Pico's PWM for sound generation.