I use earbuds a lot, primarily during long/boring/painful rides, but it's usually Audible rather than music. I pulled off the Strava CTS Bucket List challenge (574 miles in 2 weeks) and did the most recent double with substantial help from Michael Connelly and John Scalzi. I use the LG HBS700 bluetooth headset (an ingenious device, in my opinion, but way underrated - I only saw a few other people ever wearing it.)