Rosen is a lightweight mod that aims to expand on the noteblock system by adding more instruments, while trying to keep the sound design on the same level as the vanilla Minecraft.

Currently Rosen adds 18 new carefully crafted instruments such as Saxophone, Organ, Sitar, Music Box, Timpani and more! Rosen also features a Quality of Life addition that allows to play already existing instruments with the other blocks of a similar type.

№ Instrument Blocks 1 Accordion Honey Block, Honeycomb, Bee Nest 2 Beach All full coral blocks (including dead) 3 Carillon All copper blocks 4 Choir Sculk, Sculk Catalyst 5 Dholak All terracotta blocks (including glazed), Decorated Pot 6 Kick End Stone, End Stone Bricks 7 Log Drum Bamboo Block, Stripped Bamboo Block, Bamboo Planks, Bamboo Mosaic 8 Music Box Lapis Block 9 Organ Netherrack, all Nether bricks 10 Piano All full quartz blocks 11 Power Guitar Coal Block 12 Saxophone Melon 13 Sitar Dried Kelp Block 14 Synth Purpur Block, Purpur Pillar 15 Synth Bass Shroomlight, all mushroom blocks, all wart blocks 16 Timpani Mud, Muddy Mangrove Roots, Packed Mud, Mud Bricks 17 Vibraphone All prismarine blocks, Sea Lantern 18 Violin Snow Block, Powder Snow

How to add custom instruments (1.21.1+ only):

In your datapack, add a new json file named after your instrument to data/rosen/noteblock_instrument/ that follows this format:

{ "name": "<instrument_name>", "sound_event": "<sound>" }

Next, add a new file data/<namespace>/tags/block/<instrument_name>_noteblocks.json for the respective block tag that defines blocks to be used for your instrument that follows regular tag format:

{ "values": [ "<block>", "<other_block>", "<another_block>", ... ] }

Voilà!