I'm contemplating buying this, but I won't let myself until I feel like I've done all the exercises in "Beginning Haskell"[0].

0: http://www.amazon.com/Beginning-Haskell-A-Project-Based-Appr...

One thing that helps alot is the various undergrad course syllabuses that have been given with emphasis on type systems and aspects of FP, immutability, segregating and strictly marking side effects etc.

http://shuklan.com/haskell/

http://www.cs.tufts.edu/~kfisher/teaching.html

https://www.inf.ed.ac.uk/teaching/courses/inf1/fp/ (P Wadler)

http://www.cs.princeton.edu/~dpw/cos441-11/schedule.htm

http://blog.davidterei.com/2011/10/stanford-haskell-course.h...

http://www.seas.upenn.edu/~cis194/

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also the Apress "Beginning Haskell" looks pretty good, tho the writing isn't perfectly clear. The example topics and sample code look good, and that's what mostly counts.

http://www.amazon.com/Beginning-Haskell-A-Project-Based-Appr...

The books by Hutton and Simon Thompson ("Craft of FP" 3rd ed)are good intros as well. Haskell school of music is really good, but not sure for people who aren't versed in music topics (harmony/theory, composition, MIDI, DSP.

http://www.amazon.com/Programming-Haskell-Graham-Hutton/dp/0...

http://haskell.cs.yale.edu/euterpea/haskell-school-of-music/

I think this is perfect for you (and many others):

http://www.amazon.com/Beginning-Haskell-A-Project-Based-Appr...