Scan .mp3 files using cordova file plugin

I have a IONIC android app, and i am trying to scan .mp3 files in my device. I am using cordova file plugin for this purpose.

The problem here is i am unable to find my .mp3 files in Download folder. These are the directories i am scanning recursively, I am able to find my files in other folders such as Ringtones folder.

cordova.file.dataDirectory,
cordova.file.documentsDirectory,
cordova.file.externalApplicationStorageDirectory,
cordova.file.externalCacheDirectory,
cordova.file.externalRootDirectory,
cordova.file.externalDataDirectory,
cordova.file.sharedDirectory,
cordova.file.syncedDataDirectory

Is there any other folder structures i need to include to scan the files in my device ?