Perfect Fifths
Perfect Fifths
In the next set of lessons, you will see a perfect fifth lit up on your instrument and you will write it in music notation.
![](http://ultramusician.com/files/tutorials/theory/intervals/07/cg_5th.jpg)
Like other perfect intervals, both notes will usually have the same accidental.
![](/files/tutorials/theory/intervals/07/5th_fc_gd.jpg)
For example, if the bottom note is sharp, the top note will be sharp too.
Or, if the bottom note is flat, the top note will be flat too.
![](/files/tutorials/theory/intervals/07/5th_fc_gd.jpg)
The one exception is when starting on B or Bb because B is 7th degree of the C scale.
![](/files/tutorials/theory/intervals/07/5th_bf_exception.jpg)
As we learned earlier, a fifth built on this note will come out flat.
Therefore, if the bottom note is B, the top note F would require a sharp. Or if Bb, is used, then F would be natural.
![](/files/tutorials/theory/intervals/07/5th_bf_exception.jpg)
Please press the Exercise button below.