[Works on Mobile] Click the breeding structure, then click two harmonicans. Wait for the harmonicans you bred. Click on it once it has bred then wait for it in the nursery. Once it's done incubating, click on it and you have a new harmonican! Then you can start breeding all over again until you have them all. You need 3 monsters to unlock Mod.ma. You need 7 monsters to unlock Looner. For breeding and incubating, the timer needs to count up to 100 for it to be done. All monsters take the same time.
All credit goes to Raw Zebras' Web Workshop and some towards @mysinginmonsters for the project I remixed to make this
