Electric guitar, preferably with heavy distortion. Louder := better.
No but seriously I love heavy music so much. It's fun to listen to, fun to play, and it's just had a positive impact on my life. If you want to really tug on my blackened heartstrings, you gotta do it through distortion, preferably an HM-2, in as low a tuning as your guitar can handle.
I find the speculum to be excellent at letting me see deep inside myself. Instruments like ribcage spreaders are too infrequently used to count I think. A good seasonal look with the speculum could save you a lot of heartache.
Pipe Organ. The only instrument with the versatility of an orchestra at your fingertips. It can make the room shake or fill it with quiet whispers.
Sadly, Churches are one of the few places, in the US at least, where you can hear the organ regularly. Ones that can afford to maintain such a large instrument and pay an organist.
A Kora! It's an African instrument that is considered a guitar harp, with 21 strings ranging from the size of bass guitar string to fishing wire. The way it is played allows you to play the bass, lead, and rhythm at the same time. Here is a short example of a master kora player Toumani Diabate showcasing the instrument:
https://youtu.be/8luhdxS2KuM?si=llpa2YVyIOf77_Nd
My other thing would be trippy out there instruments that seem to put you in a different state of mind like the Yaybahar or "The Beam" that the grateful dead likes to break out sometimes
I really appreciate strings in general, but no instrument can emotionally move me like the violin. A melancholic violin section in an already sad song is a surefire way to make me tear up. I've never been very good at playing any instrument, but I've been tempted to pick up the violin to see if it feels as good to play as it does to hear.
The french horn gets me in the feels every time. I think it's because it reminds me of dressing up fancy and going to the symphony with my aunt as a school aged kid, as well as candle lit Christmas eve services that heavily featured them.
Pedal Steel. First time I saw one played live was at a Bright Eyes show when I was in high school. I know they’ve been around for a long time and are prominent in country music, but watching and hearing it played in person just blew me away. I feel like the instrument conveys so much emotion in its sound
A large Casavant. Any pipe organ really, but a large one with tones below the human hearing threshold really hit hard in person. They give me nonstop frisson. Almost can’t handle it, and tears stream down my face the whole time, but not from sadness; just a physiological reaction.
one of my friends rents one and played a few pieces for me. it was like existing outside of the rest of space and time. he's really good at it and it just sounds magical
Most instruments played well grips my heart and holds.
But steelpan. People see it as something carnival something something, but it fits well for a surprisingly wide span of music! The power of the bass pans in death metal as much as the "synthiness" in a melody from some NES game, it fits!
It's a keyboard that uses strings of tapes for each note. It pulls the tape over a head and plays that note until the tape runs out. When you're playing fast, sometimes the tape isn't all the way down, so it makes everything sound super custom.
Think Strawberry Fields by the Beatles. That's a Mellotron you're hearing.
As a musician the Monome Norns raspberry pi shield and lines community has been inspiring me a lot lately. It's a FOSS "sound computer" that can take on hundreds of uses.
Hard for me to choose just one. I love these three instruments because they are so peaceful and calm. Though people do use them to do covers of heavier music as well.
The Guzheng is a 21-26 string zither instrument. I love Zithers in general. There are many types from different countries.