(App)

↙ ↘

[SongDetail] [SongList]

(Redux)

↙         ↘

[Reducers]         [Action Creators]

↓                         ↓

[Song List Reducer]         [Select Song]

[Selected Song Reducer]                                

Redux Store [Reducers] → [Provider] → [App] → [Connect] (with Provider & Action Creator) → [Song List]