While it may be possible to operate the Sunday Keys App at the same time as other popular apps focused on live worship music, we cannot specifically confirm that multitasking will work.
Your experience when multitasking is likely to be influenced by a number of factors, including the specific Apps involved, your iPad’s capabilities, and the specifics of your use case and hardware.
We always recommend stress-testing any possible combination of software in a non-performance context before taking it to the stage.