About this song by Eminem, Stronger Than I Was, Wikipedia shows Luis Resto and Eminem both as producers. My concern is that since the song contains very less rap portion did Luis composed most of the song?
As far as I knew Eminem didn't know technical music like keyboards etc.
From what I've found, Eminem (or Mathers) is credited on this song as Writer and Producer.
Eminem is an American rapper, record producer.
Also, about his own producing style:
Eminem is considered unusual in structuring his songs around the lyrics, rather than writing to beats. (...) After doing little production on Relapse and Recovery, Eminem produced a significant portion of The Marshall Mathers LP 2.
He said about producing his own music,
"Sometimes, I may get something in my head, like an idea or the mood of something that I would want, and I'm not always gonna get that by going through different tracks that other people have made. They don't know what's in my head. I think maybe it helps, a little bit, with diversity, the sound of it, but also, I would get something in my head and want to be able to lay down that idea from scratch."
Here is a list of his work as a producer.
You can also note that a record producer may have different roles in the project other that music instruments, hardware or software work:
So one can be a successful producer without knowing any knowledge in music theory or in how to play any instrument.
