Last week, All Songs Considered host Bob Boilen and I took note of an article from The Guardian examining something within music that's uniquely byzantine: the practice of giving guest artists credits in song titles. You've no doubt seen some variation of it — "Song Title (feat. An Artist)." It's something that should be fairly straightforward, no? Well, no.

"Scan the charts and release schedules and you'll see numerous variations on the theme," wrote Guardian reporter Peter Robinson, "from 'and' and 'with' to 'x', '+' and 'presents'. But they don't all mean the same thing, and there can be fierce behind-the-scenes struggles over how artists are billed, how far up the credit chain they're allowed, or whether they're even credited at all."

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