For me, from easiest to hardest (easiest first):

Sax (I've been playing it since I was a child)
Wind Synthesizer (It's an extension of sax)
Bass (as long as it's fretted)
Guitar (electric)
Flute (I don't play it often enough)
Drums (I'm decent but don't have that much stamina because I no longer have a set)
Piano (again, I don't have the time to put into it)
Voice (the hardest instrument I've learned)

Sax/Wind synth is easiest because it's my main instrument, and has been since I was a kid. I started on drums but switched to sax in the 7th grade.

I get along with the vertical bass/chord/ structure of the guitar better than the horizontal. On the guitar, both hands are doing the same thing. On the piano, both hands are doing different things. I suppose if I spent more time on the piano, it would be easier, but there just isn't enough time in the day to give everything the attention I'd like to give it. Making a living gets in the way.

I think which is harder depends on the person.


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