Sometimes we have to combine various PDF files, such as a title page and a score or movements of a piece, into one document. If you are on a PC, I'm afraid you'll have to shell out some bucks to get software that does that. Acrobat Pro works quite well. However, Mac's Preview does this quite easily.
- First, open your documents in Preview.
- If Preview is your default PDF reader, then your documents will open in it when you click on them. Otherwise, ctrl-click on your document and select Open with > Preview.
- In the upper left-hand corner of the Preview window you will see a drop-down box. Click on that and select "Thumbnails" in both documents.
- Resize your windows so that they are side-by-side. You can do this by placing your cursor over the edge of the document until it appears as a double-sided arrow. Then ctrl-click and drag in the direction that you need in order to make the window fit properly.
- Go to the window of the document that you want to be first and click on the top thumbnail if it isn't already selected. Then you can either type cmd-a, or go to the Edit window and choose "Select All". You should see a shadow box around all of the thumbnails for that document.
- Next, click and drag those thumbnails and place them above the first page of the other document. If there are several pages, be patient because it takes a couple of seconds to process the drag and drop.
Now you have your combined document!