One truth about working with audio is you always need the cable or adapter you don't have in your toolbox. That's why we love these terminal-block audio connectors so much. No soldering required! Use stranded or solid core wire and a small screw driver to create custom wiring jigs.
This is the 3.5mm Stereo Audio Plug Terminal Block. It's the most common size and style of audio connector, used in most headphones or basic audio connections you're looking to make.