Question: Al Jolson was born as Asa Yoelson (Yiddish: asa yvlsan) in the Jewish village of Srednike (Yiddish: sr'dnyq) now known as Seredzius, near Kaunas in Lithuania, then part of the Russian Empire. He was the fifth and youngest child of Moses Rubin Yoelson (1858 - December 23, 1945) and Nechama "Naomi" Cantor (1858 - February 6, 1895); his four siblings were Rose, Etta, another sister who died in infancy, and Hirsch (Harry). Jolson claimed not to know when he was born, and later chose to claim he was born on May 26, 1886.

In the spring of 1902, he accepted a job with Walter L. Main's Circus. Although Main had hired Jolson as an usher, Main was impressed by Jolson's singing voice and gave him a position as a singer during the circus' Indian Medicine Side Show segment. By the end of the year, the circus had folded and Jolson was again out of work. In May 1903, the head producer of the burlesque show Dainty Duchess Burlesquers agreed to give Jolson a part in one show. Asa gave a remarkable performance of "Be My Baby Bumble Bee" and the producer agreed to keep him for future shows. Unfortunately, the show closed by the end of the year. Asa was able to avoid financial troubles by forming a vaudeville partnership with his brother Hirsch, now a vaudeville performer known as Harry Yoelson. The brothers worked for the William Morris Agency. Asa and Harry soon formed a team with Joe Palmer. During their time with Palmer, they were able to gain bookings in a nationwide tour. However, live performances were falling in popularity as nickelodeons captured audiences; by 1908, nickelodeon theaters were dominant throughout New York City as well. While performing in a Brooklyn theater in 1904, Al decided on a new approach and began performing in blackface, which boosted his career. He began wearing blackface in all of his shows. In late 1905, Harry left the trio following an argument with Al. Harry had refused Al's request to take care of Joe Palmer, who was in a wheelchair, while he was dating. After Harry's departure, Al and Joe Palmer worked as a duo but were not particularly successful. By 1906 the two agreed to separate, and Jolson was on his own. Jolson became a regular at the Globe and Wigwam Theater in San Francisco, California, and remained successful nationwide as a vaudeville singer. He took up residence in San Francisco, saying the earthquake-devastated people needed someone to cheer them up. In 1908 Jolson, needing money for himself and his new wife, Henrietta, returned to New York. In 1909, Al's singing caught the attention of Lew Dockstader, the producer and star of Dockstader's Minstrels. Al accepted Dockstader's offer and became a regular blackface performer.

Using a quote from the above article, answer the following question: What did critics say about him?
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Question: Peter Green (born Peter Allen Greenbaum, 29 October 1946) is a British blues rock guitarist. As the founder of Fleetwood Mac, he was inducted into the Rock and Roll Hall of Fame in 1998. Green's songs, such as "Albatross", "Black Magic Woman", "Oh Well", "The Green Manalishi (With the Two Prong Crown)" and "Man of the World", appeared on the record charts, and several have been adapted by a variety of musicians. Green was a major figure in the "second great epoch" of the British blues movement.

Green was eventually diagnosed with schizophrenia and spent time in psychiatric hospitals undergoing electroconvulsive therapy during the mid-1970s. Many sources attest to his lethargic, trancelike state during this period. In 1977, Green was arrested for threatening his accountant Clifford Davis with a shotgun. The exact circumstances are the subject of much speculation, the most famous being that Green wanted Davis to stop sending money to him. In the 2011 BBC documentary "Peter Green: Man of the World", Green stated that at the time he had just returned from Canada needing money and that, during a telephone conversation with his accounts manager, he alluded to the fact that he had brought back a gun from his travels. His accounts manager promptly called the police, who surrounded Green's house. In 1979, Green began to re-emerge professionally. With the help of his brother Michael, he was signed to Peter Vernon-Kell's PVK label, and produced a string of solo albums starting with 1979's In the Skies. He also made an uncredited appearance on Fleetwood Mac's double album Tusk, on the song "Brown Eyes", released the same year. In 1981, Green contributed to "Rattlesnake Shake" and "Super Brains" on Mick Fleetwood's solo album The Visitor. He recorded various sessions with a number of other musicians notably the Katmandu album A Case for the Blues with Ray Dorset of Mungo Jerry, Vincent Crane from The Crazy World of Arthur Brown and Len Surtees of The Nashville Teens. Despite attempts by Gibson Guitar Corporation to start talks about producing a "Peter Green signature Les Paul" guitar, Green's instrument of choice at this time was a Gibson Howard Roberts Fusion guitar. In 1986 Peter and his brother Micky contributed to the album A Touch of Sunburn by Lawrie 'The Raven' Gaines (under the group name 'The Enemy Within'). This album has been re-issued many times under such titles as "Post Modern Blues" and "Peter Green and Mick Green - Two Greens Make a Blues", often crediting Pirates guitarist Mick Green.

Using a quote from the above article, answer the following question: what was he doing at that time?
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Green contributed to "Rattlesnake Shake" and "Super Brains" on Mick Fleetwood's solo album The Visitor.