def extract_samples(arousal, valence, found_song_ids):
    """
    Extracts the samples for the found songs and then removes 'song_id' column.

    Args:
        arousal (pandas.DataFrame): 2D Pandas DataFram with labels for arousal.
            Dimensions: [song_id, sample]
        valence (pandas.DataFrame): 2D Pandas DataFram with values for valence.
            Dimensions: [song_id, sample]
        found_song_ids (np.array): A list of song

    Returns:
        arousal, valence (pandas.DataFrame, pandas.DataFrame):
            Modified arousal and valence 2D pandas objects.
    """
    # Extract the labels for the found data and remove the 'song_id'-column
    labels_arousal = arousal[arousal['song_id'].isin(
        found_song_ids)].set_index('song_id', drop=True)
    labels_valence = valence[valence['song_id'].isin(
        found_song_ids)].set_index('song_id', drop=True)
    return labels_arousal, labels_valence