Like play 3 notes on the guitar and sing a melody of 4 notes.
looks like this:
V--1-2-3-4-1-2-3-4-1-2-3-4-1-2-3-4
G--1-2-3-1-2-3-1-2-3-1-2-3-1-2-3-1 ...etc
V=Vocals
G=Guitar
That would be 3:4 (3 on guitar and 4 on vocals)
Also practice 3:5, 4:5, 5:7 and so on.
You do not necessarily have to pay too much attention to what the melody is and some of the notes might sound odd otgether - its basically about independance - doin two things at the same time.
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