Reproduction steps:
1) Open project "SoundTest"
2) Open scene "SongMenu"
3) Enter play mode
--- You should hear music playing
4) Press "load" button
--- The music will stop playing in Unity 5.4, but will play in 5.3

What happens in this project:
--- An audio clip is loaded from StreamingAssets
--- It is played (if this step is skipped, bug becomes unreproducible)
--- A new scene is loaded and the loaded audio clip is passed into a new scene
--- Clip is assigned to audio source and is played

Regression introduced in 5.4