I usually plan to plan with a planner...at least that's the plan

There are a lot of good, useful liturgy planners out there for music, including:

AIM (World Library Publications/J.S. Paluch Co., Inc.)
Today's Liturgy (Oregon Catholic Press)
G.I.A. Quarterly (G.I.A.)
Liturgy Planning Guide (Life Teen)

All of them provide helpful, useful information and ideas for planning the music for your upcoming parish liturgies. Instead of relying on a single resource (like one of the above) I usually lay out ALL of those and get a lot of different points of view. Most companies that publish planners typically suggest their own copyrighted music (or public domain titles) for the majority of the song/hymn suggestions. That's fine, which is why I like to have a larger base from which to choose. At St. Ann's, we don't stick with one hymnal, one publisher, or one resource, or even one style of music. We draw from everywhere.  We use everything from traditional to contemporary worship music for our liturgies.

I think it's important to say that, just because it's written in a planner, it doesn't mean you HAVE to incorporate those suggestions, or that they're even right for YOUR next liturgy at YOUR parish. They are suggestions. They are meant to be a helpful tool as you make the best decisions for your liturgies.

You may find that a lot of the songs you would choose aren't listed there. Often times it's impossible for publishers to list every option, so they may choose to go with a reliable stand-by or something new and fresh for a particular suggestion. Just know that the planning guides are not 'law;' they are not 'required.' They are not 'official.' They are suggestions. Use your best judgment, but use the planners. They could be just what you're looking for, or show you something you would have never thought of yourself, or even lead you to new ideas.