40/27

40/27 |3 -3 1>

680.4487 cents

File:Jid 40 27 pluck adu dr220.mp3 sound sample

The grave fifth of 40/27 is the interval between 9/8 and 5/3. It is 81/80, a syntonic comma, flat of 3/2. In some contexts it may be considered a wolf fifth. In meantone, of course, it is equated with a perfect fifth.