[Moose408]

Tempo is independent of the notes in a measure.

For example if you have 4 quarter notes in a measure and the tempo is 60bpm there will be 4 beats in the measure and you will play a note each second. If you take that same measure and increase the tempo to 120bpm you will play two notes every second (using downstrokes). It gives the same result as playing 8 eighth notes at 60bpm but it is a completely different piece of music.