Music/Movie stores in Madrid and Sevilla?

I really want to buy Spanish-language music CDs (Cuarteto de nos, Plastilina Mosh, Amigos Invisibles) while I'm here in Spain since I can't find these particular ones in the United States. I know these are Latin American bands, but I figured I might be able to find them here. I'm in Sevilla right now, and El Corte Ingles has a terrible selection of mostly American pop artists. I'm also looking for the soundtrak of El Calentito. Also, I'm looking for a place to buy Spanish films on DVD. I know it's a different region code here, but I'm relatively certain I can watch them on my laptop. I'll be in Madrid this weekend and will hopefully be able to find a better selection. Any suggestions?