The music I like most is free... improvised in nature.
I love spontanious, energetic jams, and long building solos.
The songs I like most always have to do with how I connect with the words.
I like to find my own personal meaning in lyrics,
so the more open a lyric is for (poetic) interpretation,
the more I like.
Or I may just connect with the message in a lyric,
and as well, some of the primary musical "devices" employed in the composition.
(ie... a catchy hook... or a contrast in sections... or even just an "attitude").
As a musician, I have found
that if I can connect with maybe three primary elements of a particular song,
that I can enjoy the experience of playing/performing that song.
(even if I would not say it is one of my "favorites")
When I can find a way to put a personal twist on it,
or incorporate a "jam" section (improvisation) ,
I have fun with it all the more.