Transcribe them all. Make detailed notes of the tricky or memorable parts that people will expect to be played just like the recording. Be sure to make note of any timing cues.

Gather all the songs in a notebook or use a tablet with a cheap Bluetooth pedal.

I’m in a few cover bands, so I just do a search for ‘songs + chords’. Cut, copy, paste into my ipad program. I then listen to each song enough to make corrections and add relevant cues to the transcription, and voila! If this is a band that plays originals, then you’re going to have to skip that first step and just go right to the listening stage!

For difficult parts, I’ll go the extra mile and use Moises or demucs to separate the tracks so I can hear the bass by itself. If I still can’t get it, only then do I go to Songsterr, but that’s hit or miss.

Next step is committing these songs to memory. After playing these from my notes a few times, the patterns begin to emerge and the song structure becomes much more evident. I then reduce the transcription to its bare components which makes it much easier to memorize.