Music format for bringing to audition/demo

"Gum, mints, toothbrush, floss, tissues, pens/pencils, sunglasses, reading glasses, phone charger, hair bands, bobby pins, nail file, advil, Starbucks gift cards, a book, lotion, granola bars, chapstick, single use Super Glue, eyedrops and some CD's LP's et cetera."

Two-step radius from the check-out at CVS?

A couple of years ago, or a couple and a half, I went through a few stores bringing my CDs and files on a drive. Wherever I went, except one, they had no CD Player readily available and, at that time, it was the same for USB connected files. In all places, except that lonely one, they brought me an iPad with Tidal and asked what I wanted to hear. It just happened that Tidal did not have what I wanted. In the end, I would enter and ask if they had a CD player, rather than ask to check the speakers I came in for.

The only place that was ready for CD and USB drive was.....Crutchfield.

So, nhb1, bring all you have, but expect an iPad.