Listen "Tuning and temperament (10 mins, ~9 MB)"
Episode Synopsis
                            In Pythagorean tuning the 5ths are true i.e. in the frequency ratio 3/2.  In 1/4 Comma Mean Tone the major 3rds are true i.e. in the frequency ratio 5/4.  Both tunings give rise to the wolf which restricts the number of playable keys to 6 major and 3 minor.  In Equal Temperament all keys are playable but neither the 3rds or 5ths are true.  In circular temperaments the total reduction in all 5ths round the circle is one comma; all keys are playable but some usually sound better in tune than others.                        
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