Decades ago, I used to cut out the AM and FM radio dial listings from the newspaper every so often. I thought it was important to always a have a readily available list of all local call letters, frequencies, and formats. I scanned those listings regularly for format changes. It always irked me slightly when a station changed formats without my knowing about it beforehand. I vowed I wasn't going to let that happen if I could help it, so eventually, checking the station listings became a daily routine.
I'm less manic about it now, but I still want to know the call letters, frequency, and format of every local station. I know that not every format will interest me, but I always want to know what's out there.