I'm currently studying counterpoint (not with an instructor, though I do have knowledgable people around me (though not at the moment obviously) that can check my work and give me pointers if i ask) My question has to do with the counterpoint line being in the same mode as the cantus firmus. this does not seem to be a problem when the counterpoint line begins on the unison with the cantus firmus but only when it starts on the fifth. My question: as long as I am no using accidentals and it ends on the first degree of the mode, how can the counterpoint line be in a different mode than the cantus firmus? I will continue to look for an online resource that thoroughly explains this and will post here if I find an answer. I've read this section in Fux's text but am still confused. any insight is appreciated. Thanks in advance!!!