This bar graph illustrates the average sentiment of songs across various genres over the past 60 years, with each song classified using the Spotify API. Sentiment scores range from -1 for pessimistic songs to 1 for optimistic songs, as determined by the Natural Language Processing toolkit (NLTK). While all genres generally show a positive sentiment, averaging around 0.5, rap is notably lower, with an average sentiment of about 0.2. This discrepancy could be attributed to a potential bias in NLTK's processing of swear words, which are typically marked as negative and are more prevalent in rap music.