I like to have background music while I’m listening to an audiobook or a podcast. This helps me keep focused while commuting in a noisy crowded transport.
Since iOS does not allow playing two audio sources at the same time, I’m using web interface of Spotify, Youtube and audiobookshelf apps on Brave. This mostly works with some quirks. But since Apple has been crippled media volume controls on iOS webkit, I cannot change volume on youtube or audiobookshelf (spotify itself does not support that). I’m not sure if this is possible, but being able to lower the volume of music while listening a spoken content would be very nice.