The cassette deck is fading in popularity in cars, but its former ubiquity in prior decades led headphone-jack adapters to become a fact of life for people who wanted to plug in a phone or iPod. How were they able to do their thing? https://www.vice.com/en_us/article/gyz9j7/the-car-cassette-adapter-was-an-unsung-hero-at-the-dawn-of-the-digital-age

@estherschindler - phone -> usb-c to 3.5mm jack adapter -> 3.5mm to cassette adapter

now, Spotify in my 1981 Citation!