I do enjoy my music and a phone that does a poor job of reproducing music is a "fail!" When I stared looking for a replacement for my Galaxy Nexus I narrowed down my selections to either a Nexus 5 or the Xperia Z1s. While reading reviews there were conflicting opinions about the sound quality on the Z1s which had me a little concerned. Since I'm posting here, I suspect you can guess which phone I chose and I'm posting this entry to share my audio listening experience with the Z1s. For those who don't want to read through this lengthy post, I'll cut to the chase...I like the sound that Z1s produces. For a digital music player housed in a phone it does a fine job. I tested with both the stock music player and Poweramp and I was able to craft an enjoyable music listening experience with both. If that's all you want to know you can stop here. If you want to know how I came to this impression, keep reading. Let me state the obvious......how music sounds is very SUBJECTIVE and personal. All that I share here is subjective also. This is why I use the term "enjoyable" since IMHO that is what's important. To help you understand a little more about my perceptions it might help to know more about my music listening background and the equipment I used while experimenting. I am a product of the analog music reproduction generation. I cut my teeth on vinyl, turnatables, preamps and power amps connected to floor standing speakers. It's funny....analog is back in fashion...my kids think I'm cool! I also play bass guitar and still "basement jam" with friends. So I have experience in both recorded and live music that has shaped my perception of what sounds good to me. While conducting my very unscientific listening evaluation I used Monster Miles Davis Tribute in-ear headphones (not to be confused with anything in the Beats category), Klipsch S4 in-ear headphones, Bose QC15 over-ear headphones and a Bose Soundlink Mini Bluetooth speaker. I was able to achieve an enjoyable listening experience with all this gear. Equalization varied based on which listening device and music player I was using. The Walkman music player software produced acceptable results. This music player seems to have a sound profile that favors mid range sound. The five band equalizer helps, but I like to be able to adjust more than 5 bands. One feature I found useful is the "Clear Bass" function located at the bottom of the equalizer screen. If I wanted to just boost or cut the bass a bit, this feature was handy. I thought ClearAudio + was worthless.....to my ears it sucked the life out of the music. Also the Walkman app does a poor job of updating album art. I have used Poweramp for years and it is my "Go To" music player app (Yes, I am biased on this front). In comparison to the Walkman app the sound is more balanced, open and warm. It also has a 10 band equalizer which helps me fine tune my listening experience and does a great job up updating album art / meta data. What surprised me was I was able to use Sony's Walkman sound features within Poweramp. On the tone control panel within Poweramp a Sound FX button was added and by long pressing on it I was able to access Sony's sound shaping tools....very cool! I've rambled long enough. I hope this helps! If you have questions, post them below. Cheers! P.S. I am not a big listener of classical music, so, no classical music was used.