For the people who like a wobbly g-string on their guitar to play more expressive I have three versions of the wonderful tune Claire de Lune by turn of the 19th/20th century composer Claude Debussy.
The first is a theremin version with the ultimate degree of pitch modulation.
The second is a violin version with the moderate pitch vibrato that the movement of the left hand permits.
The third and last version is played on harmonica and for me is the winner in the emotion (and sound) department.
So in conclusion: there’s more to an emotional sound than shaky pitch.