Simply don't load all at the beginning?
You can still open a song from the album and browse normally to the next one from the viewing window. And if you choose the setlist button only the current open one is suggested to add to the setlists.
P.S. I assume you have created individual songs for the album from your multi-page pdf.
If you have only one pdf with several songs without individual database entries for the album then you first have to create a song/database entry which is quite simple with the snippet function (and you can assign a setlist and other metadata too for the creation IIRC).
You can still open a song from the album and browse normally to the next one from the viewing window. And if you choose the setlist button only the current open one is suggested to add to the setlists.
P.S. I assume you have created individual songs for the album from your multi-page pdf.
If you have only one pdf with several songs without individual database entries for the album then you first have to create a song/database entry which is quite simple with the snippet function (and you can assign a setlist and other metadata too for the creation IIRC).