Download the Pocket Tunes 5, "Non-Windows ZIP File" file and unzip it onto your Mac.

Note: If you are using Pocket Tunes 3 or 4, you can download the Zip for it from here

Open the folder containing the installation files with Finder, then open your Palm Desktop Quick Install (I believe in the conduit menu it says "Install files to handheld"), you can drag the files from the Finder window to the Palm install window, then do a hot sync to install the files.

You'll want to install the 'Install Pocket Tunes on Another OS.prc' file.

If you want WAV and/or OGG support, please see this Knowledge Base article on how to download and install them.

Finally, if you use a Tungsten T3, you will need to contact Palm support for the files AppSlipRotate.prc and StatusBarLib.prc, they allow you to rotate the screen etc. Alternatively you can do a Google search for the two files as they are standard Palm files. They are ONLY for the T3, DO NOT install these final two files on any other device!