There is a lot about tuning drums and percussion on the net,
http://www.harmony-central.com/Drums/faqs.html is a good place to start and ask questions.
Tuning drums is one of my 'hang-ups', and in over 30 years of recording I have met but a few drummers and percussionists that are really masters at tuning their instruments. Of couse those are the people I will still call for sessions, people like Aynsley Dunbar, Jota Morelli, Aerto, Bara. They walk in, listen (or read) the material, get to work on their instruments and in no time at all you are recording - and it will sound great.
While some people know how to make their instruments sound ok ... there is also a, forgotten in 99% of cases .... question of what key a song is in.
Just think...... if you are recording a song in D, but someone plays an instrument, like a bongo, conga etc., with a predominent tone in a D sharp, the whole song will grind on your nerves.
Oh, almost forgot, Bongos are Latin, not African