hello - glad you like the music! For 'por conforter': this is in the Antico Editions 'Songs of the Trouveres', by Christopher Page. Antico now have a website, making it easier to get hold of! For 'Strela do Dia' and 'quen diz' - and cantigas music in general - go to Chris Elmes of Gaita - www.gaita.co.uk
. Chris produces several useful editions of medieval music. L'homme arme - can't remember where we got this from, it's just a very well-established piece that's sunk in... but it's probably the easiest to find on line being so well known, surviving in many versions.
One other thing - our version of 'quen diz' is an elaboration on the original theme. At least Paul thinks that it's 'quen diz' that's the elaboration... can't remember for sure right now... hopeless!
hope this helps!