Different instruments, different microphones. There’s no “best music mic” — there’s a best mic for each source. Here are the proven picks for each.
Recording music is the use case where every kind of microphone earns its place. Vocals want a condenser. Guitar amps want a dynamic or a ribbon. Drum overheads want small-diaphragm condensers or ribbons. Kick drums want a specialized kick mic. Acoustic guitars want one or two small-diaphragm condensers. Pianos want a stereo pair.
The single biggest factor in recorded music quality is the room. A $99 mic in a great-sounding room beats a $3,000 mic in a bedroom. Before spending big on a Neumann, spend money on bass traps, broadband absorption, and diffusion. The room is the instrument every microphone hears.