Legendary type foundry Hoefler & Frere-Jones lists the four techniques for combining fonts.
Is there a way to know what fonts will work together? Building a palette is an intuitive process, but expanding a typographic duet to three, four, or even five voices can be daunting. Here are four tips for navigating the typographic ocean, all built around H&FJ’s Highly Scientific First Principle of Combining Fonts: keep one thing consistent, and let one thing vary.
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(via daringfireball.net)
Source: typography.com
