Adios

This song is likely about drugs. "Adios" is Spanish for "Goodbye," but the lyrics are in German. Here's some translation, indicating the subject is taking heroin, and that an objective viewer can see that drugs take your life:
Er legt die Nadel auf die Ader
und bittet die Musik herein
zwischen Hals und Unterarm
die Melodie fährt leise ins Gebein

He aims the needle on the blood-vessel
and asks the music to come in
between neck and forearm
the melody drives into the bones

Nichts ist für dich
nichts war für dich
nichts bleibt für dich
für immer

Nothing is for you
nothing was for you
nothing remains for you
forever
(thanks, André - Frankfurt/Main, Germany)