In this excellent music theory tutorial Jay Asher takes you through the three kinds of minor scales with some video examples.  
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Pic 3

Why, Jay, Why? 

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Why Should I Care? 

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Jay is a Los Angeles-based composer, songwriter, arranger and orchestrator, conductor, keyboardist, as well as vocalist. As a composer, he is best known for scoring the New World Television series Zorro. Among the films and TV movies he has arranged, orchestrated and/or conducted are Paramount Pictures' Blame It On Rio Read More

Discussion

burnhole
Pretty sure you have the Melodic Minor specs wrong .
scaleboy
Burnhole is correct. All minor scales have the third flattened. The Melodic minor has the 6th and 7th sharpened when ascending.
Jay Asher
And that is what my example in Pic 5 shows. A to B a whole step (or 2nd) , the B to C natural a half step, which is the minor third. Irt would be C# if it was a Major third.

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