With the materials available in the Kings region, it was relatively easy to craft musical instruments for everyone who needed one. A guitar, for instance, was essentially a hollow block of wood strung with wires on it, so it was quite easily made with local resources.
The stereo microphone system, however, was more complex. For that, Michael had to ask ChatJK3 to help him understand the internal electronics required for sound amplification.
Once the instruments were ready, Michael gathered all of the talented artists and handed them their respective artifacts.
Yes, artifacts.
After all, Michael had fitted every musical instrument with a Mithril stone, which further enhanced the ability of its user.