The guitarist was good friends with other friends of mine, and so we met each other at parties, concerts, festivals and such. After finding out we share a taste in music we sort of decided to jam for the hell of it. That felt good, so he invited a good friend who is a drummer to join up.

Since then we've been looking around for a singer through various ways - people we know, friends of friends, random strangers in bars.

I find I've usually always come to find and do new things through friends and aquaintances. But if you don't have any musicians in your personal orbit, you could try and find places that have open mic night or free jam sessions. Sometimes people will still post musician wanted ads in local record shops as well. And of course there is theoption of searching through the internet, through subreddits for example (or maybe here if the population grows enough.)