I fixed the music loop.

Project Undercover/Assets/Audio/Music/mainmusic_edit_loop.wav.meta

@@ -0,0 +1,23 @@
+fileFormatVersion: 2
+guid: ee527e65fcd686c469dcff5013afb158
+timeCreated: 1506626174
+licenseType: Free
+AudioImporter:
+  serializedVersion: 6
+  defaultSettings:
+    loadType: 0
+    sampleRateSetting: 0
+    sampleRateOverride: 44100
+    compressionFormat: 1
+    quality: 1
+    conversionMode: 0
+  platformSettingOverrides: {}
+  forceToMono: 0
+  normalize: 1
+  preloadAudioData: 1
+  loadInBackground: 0
+  ambisonic: 0
+  3D: 1
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Project Undercover/Assets/Scenes/scene.unity

@@ -3094,7 +3094,7 @@ AudioSource:
   m_Enabled: 1
   serializedVersion: 4
   OutputAudioMixerGroup: {fileID: 0}
-  m_audioClip: {fileID: 8300000, guid: 4c08f73877bf0b2499ffa79dc92ef7db, type: 3}
+  m_audioClip: {fileID: 8300000, guid: ee527e65fcd686c469dcff5013afb158, type: 3}
   m_PlayOnAwake: 1
   m_Volume: 0.159
   m_Pitch: 1