This conversation has sparked me to download an app in order to start measuring at what levels I listen at. So, while listening to Coltrane at a satisfying level for me at the moment, the meter is displaying minimum values at 62dB, average at 68dB and peaks at 76 dB. Now, at a sound level I consider to be loud, but still enjoyable, the same corresponding values are 55 (must have started reading between tracks), 71 and 79dB.
Apps on a smartphone may not be as accurate as a dedicated SPL meter.