Expecting Rain

I was thinking either JWH or BIABH.

Desire comes to mind.

The playing is good on JWH, but it's recorded so loud and it's so high-pitched, it gives you a headache.

Better recorded on Bringing It All Back Home or Desire, I think.

Blonde on Blonde always come to mind. He plays on almost every track.

BoB for me, I think it's the album where the harmonica is best integrated into the music.

I always liked Bobs harmonica playing on his three "christian" albums. Every Grain of Sand comes to mind.
It's not on any of his albums (unfortunately), but his best harmonica playing is on the Minnesota Party Tape from 1961, the solo after This Train is bound for Glory.

Live 1966. Hands down. By a country mile. Every day of the week and twice on sunday.

If we're talking studio only then it's a toss up for me between BIABH and BoB.

Not an album, but I've watched Isis from R&C about 90 billion times. Partly due to his harp.

Every Grain of Sand is Bob's greatest harmonica playing ever!
I love the one (in) In the Summertime too.

Live '66. The harmonica breaks in Mr. Tambourine Man, Desolation Row, and Just Like a Woman are simply sublime. They are little mini orchestras within themselves.