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Read The Bleepin’ Manual
Lemme In, Plz
Newer versions of iOS let you boss around app permissions in the Settings app after you've picked the app. (Thrilling, we know.) Here's what you can tweak on iOS 10 or later:

Ooh, Your Music Library
OnSong automatically links chord charts to backing tracks stashed in your iTunes Media Library. Under iOS 9.3 & higher, we might bug you for permission to snoop on your library. If you're all "nah fam," you gotta flip this switch or OnSong's gonna sulk.
Those Annoying Ding-Dings
OnSong almost never spams you with push notifications (we're not monsters), but you can totally customize how these rare gems show up here. Or, y'know, just nuke 'em entirely & pretend we don't exist.
Background App Refresh (aka "We're Watchin' Even When You're Not")
Even when you've ditched OnSong, we could theoretically update stuff in the app if a notification drops. Pretty sneaky, right? Disable it here if that creeps you out.
Cellular Data (aka "Please Don't Bankrupt Me")
OnSong's designed to chill on WiFi or a legit internet connection. If you're rockin' a cellular device & don't wanna watch your data plan explode, you can throttle OnSong's cellular access here. You're welcome.