We have been bringing our music with us a long time ago. MP3 players, disc players and smartphones have generalized the consumption of this "nomadic" music. Obvious constraints of digital storage capacity have not allowed us to do so qualitatively so far.
This time is over because the devices in this category will allow you to listen to your favorite albums anywhere in high resolution format. The quality of the DACs and preamplifiers headphones present in these devices is the main criterion allowing you to make your choice.