+1 for Cardas quad eutectic. You can buy small lengths
of it if you don't need a whole roll.
If you want to use plain old lead/tin that's fine, but never ever use 60/40 solder for anything. Because it's not eutectic, meaning all the tin is not ionically dissolved in the lead. It is a disgusting dirty mess to deal with after it ages a little and it makes poor unreliable electrical joints. Even the telephone companies banned it many decades ago. Instead you would use 63/37 which is eutectic and perfectly fine.
The added copper and silver of cardas does make a beautiful solder joint, and can even be used to repair bad joints.
If your gear, ears and brain are up to it, you can certainly hear the difference of good solder but that's probably not a topic for cheap and cheerful.