l. Obviously I can't argue with someone's personal preferences, I can argue with most people's ability to discern an MP3 file from an uncompressed file. My brother makes a living selling very high end audio equipment, but even he will confess that most people, listening to ten music files, can't pick the compressed from the non. It's in our heads. I dare anyone here to listen blindly to ten music files and pick the compressed. It's FAR harder than you think and requires VERY serious equipment to do so... I'm talking many tens of thousands of dollars.
I will take that challenge, using any REASONABLE stereo or headphones, no "tens of thousands of dollars" needed.
Disclaimer: I have been a musician my entire life and have plenty of recording experience. So YMMV and I don't claim to speak for "the majority" in any way. Everything in this post is intended as a statement of opinion, not fact. I'll also note that I'm young enough that I grew up in the age of CD's and didn't discover vinyls until adulthood.
"Compression" is a complicated concept. There are dozens of different types of compression, both analog and digital. Can I pick out the difference between one analog compressor used in a recording chain VS another ... not likely. But I will guarantee you that if you take a song in it's original wave format (the way it was mastered), and another that has been converted to MP3 with no other alterations made and play them both on the same equipment I can pick out which is which every single time.
I agree with the previous poster who said that MP3 is a low-quality format. I think that they sound absolutely awful. The compression process used to convert songs to MP3 absolutely destroys the headroom, air, texture and dynamic of the song IMO.
All that being said, with most music being produced today the conversion to MP3 is hardly the worst atrocity being committed against the music. Bands began over-compressing their recordings decades ago to create a "brickwall" sound. Oasis, way back in the 90's, was among the worst offenders. Metallica's most recent album "Death Magnetic" was so badly "brickwalled" during the mastering process that I found it absolutely painful to listen to. At first it was just rock bands, but slowly the process found it's way over into pop, country, and just about everything else. At this point, it's just become "the norm" and that is very sad. A few artists/bands refuse to destroy their work in this way (Tool comes to mind) but they are the exception, not the rule. Please Google search "The Loudness Wars" for more information about using compression for a "brickwalling" effect.
MP3's gave us mobile music libraries. They have allowed many people to connect with music in new, exciting, wonderful ways. However they just simply aren't for me. As MSO alluded, it's one of many technological advancements that is both a blessing AND a curse.
When I sit down in my home to enjoy my favorite music, I prefer vinyls. It's just an opinion, I'm not saying that everyone has to agree. I enjoy the warmth, headroom, dynamics, etc that vinyls provide. When listening to newer music that isn't available on vinyl, I prefer some form of wave file over MP3.
Sorry for the long post ... but the subjects of sound quality, compression, and format are near and dear to my heart.
One last thought: I have long believed that a great song, performed well, will overcome some pretty terrible sound quality, but even the best recording and sound quality can't save a bad song. I will NEVER turn off a good song because I dislike the sound quality. A good tune is a good tune ... I don't care if it's on a stretched cassette tape, a beeswax cylinder, or a $100,000 stereo. TURN IT UP, THIS SONG IS ROCKIN!