That could be one of many factors.
For something to be perceived as musical, there must be an emotional connect.To begin with, one of the most important aspects is tonality - the ubiquitous "analog" sound everybody seems to keep on chasing. In contrast, it's not a biggie for HT.
Nevertheless, before we start throwing darts in the dark, let's try and zero in on the problem so that you can help us help you better.
For starters, if i remember correctly, you found songs played through some speakers such as a pair of Dalis and the SVS Prime Pinnacles "musical".
As such (1) how were you playing music through these speakers? Was it the same modus operandi as your home i.e. FLAC files from your phone through airplay to the AV receiver? (2) Again, i am assuming it was an AV receiver that that was being employed during your auditions. Was it the same AVR or was it an amp? (3) if it was an amp, was it connected to a DAC? (4) if there was a DAC, which one was it?
If it stops at (1), it's possibly your room and/or the way you've setup your speakers.