Title: It works, but it's not the best way. Recommend against it.
Review: Number 1: This is not a book for anyone who's starting out with ear training. It's not fun, it's tedious, you'll get bored and stop.Number 2: I don't recommend it for more mid-level students. Same reasons as above, only slightly fewer people will drop out (maybe).Number 3: I don't recommend it for advanced and atonal sight reading. There are better books for one. Again, this will work, but it's hard to imagine people finishing it. But if you're truly dedicated, and mind numbing exercises work with you, give it a try. Think of it as a slot machine. It might work, but the odds are against it, and you'll regret the money spent.FYI - I've got a MA in Music about 35 yrs ago and I've taught sight reading.
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