Disabling/Enabling Mission 2: The Banquet music:

Paste this command into your chat box and click enter, to disable the music for the 1st part of Mission 2:
/setblock -326 64 1567 air

Paste this command into your chat box and click enter, to disable the music for the 2nd part of Mission 2:
/setblock -302 65 1564 air

You must enter BOTH of the commands above to disable ALL the music for Mission 2.

To re-enable music for the 1st part of Mission 2, paste this command into your chat box and click enter:
/setblock -326 64 1567 minecraft:unpowered_repeater 1

To re-enable music for the 2nd part of Mission 2, paste this command into your chat box and click enter:
/setblock -302 65 1564 minecraft:unpowered_repeater 1

Disabling/Enabling the Bonus Mission music:

Paste this command into your chat box and click enter before you click the button to start the first cutscene, to disable the music for the 1st cutscene in the Bonus Mission:
/setblock -411 51 1717 air

To re-enable music for the 1st cutscene in the Bonus Mission, paste this command into your chat box and click enter before you click the button to start the first cutscene:
/setblock -411 51 1717 minecraft:redstone_wire
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Paste this command into your chat box and click enter before you click the button to start the second cutscene, to disable the music for the Credits at the end of the Bonus Mission:
/setblock -877 54 1507 air

To re-enable music for the Credits in the Bonus Mission, paste this command into your chat box and click enter before you click the button to start the second cutscene:
/setblock -877 54 1507 minecraft:redstone_wire