ob·ses·sion
I'm obsessed with Irish music.


noun
noun: obsession
the state of being obsessed with someone or something.
an idea or thought that continually preoccupies or intrudes on a person's mind.
"she cared for him with a devotion bordering on obsession"
"he was in the grip of an obsession he was powerless to resist"
"that new car has become his obsession" (google).