That is one solution, and in some scenarios it might not even be noticeable, but it's basically conceding the problem and accepting a guaranteed audio dropout at the end of every 'song', since for this to work you need some dead time to ensure all buffers are drained and start the new stream.
The simplest model is a source that generates a continuous audio stream, and a sink that plays it back; adding the idea of songs complicates the model, and in some use cases might be totally inappropriate. For elevator music, sure it likely doesn't matter, and maybe you can hide it in a crossfade or something with enough metadata, but this is probably part of a system where you put audio into one device connected to the network, that might include live stuff like PA announcements, and it comes out a bunch of other ones, not a dedicated elevator music system.
The simplest model is a source that generates a continuous audio stream, and a sink that plays it back; adding the idea of songs complicates the model, and in some use cases might be totally inappropriate. For elevator music, sure it likely doesn't matter, and maybe you can hide it in a crossfade or something with enough metadata, but this is probably part of a system where you put audio into one device connected to the network, that might include live stuff like PA announcements, and it comes out a bunch of other ones, not a dedicated elevator music system.