function getMusic(IStorageFolder folder) {
int cnt = 0;
var folders = await folder.GetFoldersAsync();
if (folders != null)
foreach (var fol in folders)
await getMusic(fol);
var files = await folder.GetFilesAsync();
foreach (var file in files)
{
MusicProperties musicProperties = await file.Properties.GetMusicPropertiesAsync();
source.Add(new Music("artist", "title", "album");
cnt++;
}
}