Bob Dylan is an American singer and songwriter whose career has spanned over 60 years. He is widely regarded as one of the greatest songwriters of all time, known for his political, social, philosophical, and literary lyrics. Dylan's most celebrated work dates from the 1960s when he released the albums The Freewheelin' Bob Dylan, The Times They Are a-Changin', and Another Side of Bob Dylan. He adopted electrically amplified rock instrumentation in the mid-1960s and recorded three influential rock albums. Dylan has released over 39 studio albums and has sold over 145 million records worldwide. In 2016, he was awarded the Nobel Prize in Literature. Dylan has also published nine books of drawings and paintings, and his work has been exhibited in major art galleries.