You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: spm_DEM_play_song.m
    path of file: ./repos/spm12/toolbox/DEM
    
    the code of the file until where you have to start completion: function [Y,FS] = spm_DEM_play_song(qU,T);
% displays the song-bird images specified by the states in qU
% FORMAT [Y,FS] = spm_DEM_play_song(qU,T);
%
% qU   - conditional moments of states (see spm_DEM)
% T    - number of seconds over which to play the sound
%
% Y    - sound image
% FS   - sampling rate (Hz)
%
% A button press on the spectrogram will play the song
%__________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

    
function [Y,FS] = spm_DEM_play_song(qU,T);
% displays the song-bird images specified by the states in qU
% FORMAT [Y,FS] = spm_DEM_play_song(qU,T);
%
% qU   - conditional moments of states (see spm_DEM)
% T    - number of seconds over which to play the sound
%
% Y    - sound image
% FS   - sampling rate (Hz)
%
% A button press on the spectrogram will play the song
%__________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging
 
% Karl Friston
% $Id: spm_DEM_play_song.m 6044 2014-06-14 10:22:46Z karl $
 
% load frequency modes
%--------------------------------------------------------------------------
try, T;           catch, T = 2;  end