Your favorite corner
Leave a mellow track outside your regular cafe. Add a note about slow mornings. Someone on their way to work might find exactly what they needed.
A few possibilities
Where people plant songs
Three places a seed could go, and what happens when someone walks past it.
The long way home
Take a walk through the park and discover a seed nearby. Stop for a preview. Collect a song you might never have searched for.
A familiar route
Plant the song that has been keeping you company on your commute. Someone who walks the same way to the station can collect it.