There's a lot of good to be said about the Music app. It makes managing massive music collections as painless as possible, and we can even create and edit playlists on the go now. But there's one feature that I keep quietly wishing for...a queue. Sometimes I like the current song, but not the one I know is coming next; I want to finish this song while being able to pick the next one. Instead, the Music app forces us to either cut off the current song or wait for the song to finish (and then quickly select the song we want next). It's a small annoyance, but still. I like my Apple gadgets to be perfect. I don't want to think about their limitations!
Hence: Instant Queue to the rescue! Instant Queue is a bare-bones solution to the "queueing problem." With Instant Queue, you can select one or more songs to be played next. And...well, that's it, really. Instant Queue will remain running in the background thanks to multitasking, and will automatically play the songs in your queue in order. Note that you can't import playlists or save queues.
I don't know if the "queueing problem" really warrants an entire app, but nevertheless—whenever I run into it, it's like an itch begging to be scratched. To continue the analogy, Instant Queue is a simple, efficient backscratcher. It doesn't try to replicate all of the Music app's features, though it mimics its appearance. Instead, it focuses on solving a single, irritating problem. And solve it it does.
If you, too, suffer from the "queueing problem," check out Instant Queue on the App Store.