Incoming text messages, phone calls, emails, interruption by a passer-by, a smoke break, a bathroom break, a snack break, lunch break, a funny story, a side comment, brain-shaped popcorn (see photo), etc.Obviously there are times where some of those examples could be appropriate during a co-write. However, the timing is of utmost importance. Instead of a speed bump, an interruption could function as more of a rest stop along the creative highway. Sometimes the best thing you can do for the song (and for your relationship with your co-writer) is to get out and stretch for a few minutes.
(In unrelated news, Speed Bump happens to be my favorite comic.)
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