This work is a bit subversive. On the surface it plays at being a candy sweet statement to the power of music in our lives; how that music can change our mood and outlook. But there is more than that going on here. The ending line, "and the song ends", is a bit ominous. After the opening verses set us up for a bleak and suffocating landscape, we get relief from the ending verses until the last line. What does happen after the music ends? Thats the question that will bounce around in your head long after you are done reading the poem.
"My musical drug" "spreading a sweet poison" and "eroding the remaining happiness I still have"; these lines turn music from a pleasant and benign force to an escapist drug. The narrators action, "I plug my headphones", then becomes a shutting out of the world. With this turn inward, the music becomes a solipsistic opiate (think heroin) that at best is covering up the bleakness of the opening verses. This works wonderfully as an under-current or counter-current to the superficial lightness of poem. Well done!
And now, of course, I'm left wondering what sort of music you might be listening to. Maybe you could provide a playlist? (Bonus points for songs that aren't american (cause I'm looking for new and intersting.))