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Not so much a snippet as a massive great chunk today.
I was listening to a sermon last night that, among other things, talked about not striving and trying to do things in our own strength, but trusting God to bring about the apparently-impossible.
What a great example this is of that. I can’t get my head around the idea of God sending an evil spirit, but whether he sent it or allowed it, the outcome is the same: Saul becomes tormented, his servants suggest a harpist (which seems fairly random), he tells them to find him one, and one of them just happens to be aware of David – a kid of no consequence who spends most of his time in the fields outside Bethlehem.
And so, David gets brought into the courts of the king and presumably gets a chance to learn some of the ins and outs of running a kingdom long before God places the job into his hands. Amazing.
God is much better at directing our paths than we are. Our task is simply to follow in obedience.
Scripture snippets 
Harp music is so lovely, gentle and lyrical – I presume it is in all cultures it probably was thought by the servants as likely to be something to calm Saul down better than anything else they could think of. These initial stories of David and Saul are so mixed up it’s difficult to sort out what happened when, but as you say it’s lovely to see God had his hand on David from the beginning leading him along and he already had a reputation and was trustworthy.