Answer by taking a quote from the following article:

Michael Bernard Bloomfield (July 28, 1943 - February 15, 1981) was an American guitarist and composer, born in Chicago, Illinois, who became one of the first popular music superstars of the 1960s to earn his reputation almost entirely on his instrumental prowess, since he rarely sang before 1969. Respected for his guitar playing, Bloomfield knew and played with many of Chicago's blues legends before achieving his own fame and was instrumental in popularizing blues music in the mid-1960s. He was ranked number 22 on Rolling Stone's list of "100 Greatest Guitarists of All Time" in 2003 and number 42 by the same magazine in 2011. He was inducted into the Blues Hall of Fame in 2012 and, as a member of the Paul Butterfield Blues Band, was inducted into the Rock and Roll Hall of Fame in 2015.

Bloomfield also made an impact through his work with Al Kooper, who had played with Bloomfield on Dylan's "Like a Rolling Stone". Kooper had become an A&R man for Columbia Records, and Bloomfield and Kooper had played piano on Moby Grape's 1968 Grape Jam, an instrumental album that had been packaged with the group's Wow collection.  "Why not do an entire jam album together?" Kooper remembered in 1998, writing the booklet notes for the Bloomfield anthology Don't Say That I Ain't Your Man: Essential Blues, 1964-1969. "At the time, most jazz albums were made using this modus operandi: pick a leader or two co-leaders, hire appropriate sidemen, pick some tunes, make some up and record an entire album on the fly in one or two days. Why not try and legitimize rock by adhering to these standards? In addition, as a fan, I was dissatisfied with Bloomfield's recorded studio output up until then. It seemed that his studio work was inhibited and reined in, compared to his incendiary live performances. Could I put him in a studio setting where he could feel free to just burn like he did in live performances?"  The result was Super Session, a jam album that spotlighted Bloomfield's guitar skills on one side. Bloomfield, who suffered from insomnia, left the sessions after the first day. Guitarist Stephen Stills completed the album with Kooper. It received excellent reviews and became the best-selling album of Bloomfield's career. Its success led to a live sequel, The Live Adventures of Mike Bloomfield and Al Kooper, recorded over three nights at Fillmore West in September 1968.

all they did was play piano together? (mike and al)
guitar skills