A few days ago I mentioned the chant sheets for celebrants made available by the The Windsor Tridentine Mass Community.
Another very useful resource for priests is provided by Fr Mark Withoos who posts a podcast each week with the chants for the Mass - collect, Epistle, Gospel, and postcommunion. Father started last November with the 25th Sunday after Pentecost. He posts a podcast each week with the chants for the next Sunday. There is also a podcast with the basic chants to know.