class Telbe::Audio
file_id String Unique identifier for this file duration Integer Duration of the audio in seconds as defined by sender performer String Optional. Performer of the audio as defined by sender or by audio tags title String Optional. Title of the audio as defined by sender or by audio tags mime_type String Optional. MIME type of the file as defined by sender file_size Integer Optional. File
size thumb PhotoSize
Optional. Thumbnail of the album cover to which the music file belongs