This happens if Minecraft's internal sound channels are maxed out. Increase your sound channels using a optimization mod like Enhanced Audio or edit your options.txt file to increase soundChannels .
Here is a deep dive into that specific item and its context within the game: ultralight midi player resource pack top
To get the absolute best performance out of your MIDI resource pack, follow this optimal installation workflow: Step 1: Install a Performance Mod Engine This happens if Minecraft's internal sound channels are