Ok finally solved.
I´m going to share my code to anyone who wants to add a spinning cd:
//////////////////////////////////////
// ANIMATION CDART PRESERVE ASPECT RATIO
//////////////////////////////////////
local cdart = fe.add_artwork("cdart", flx*0, fly*0.27 flw*0.19, flh*0.25);
cdart.preserve_aspect_ratio = true;
local cdart_rotation = {
when = Transition.ToNewSelection ,property = "rotation", start = 0, end = 360, time = 3000, loop = true
}
//Animation
animation.add( PropertyAnimation( cdart, cdart_rotation ) );