Question: John Rzeznik and Burton Cummings, have which mutual occupations?
Context: "I'm Still Here (Jim's Theme)" is a song written by the Goo Goo Dolls frontman John Rzeznik for Disney's animated film "Treasure Planet".  The song is in the key of A Major and was released by Rzeznik as a single away from The Goo Goo Dolls.  It was a moderately successful pop hit. "Stand Tall" is the title of an international hit single by Burton Cummings, taken from his eponymous debut album.  The song was released less than two years after "Dancin' Fool", the final hit single by the group for which Cummings had been lead singer, The Guess Who. Something for the Rest of Us is the ninth studio album by American rock band Goo Goo Dolls.  It was released on August 28, 2010 in Australia and on August 31 in North America through Warner Bros.  Records.  The recording process took place during the spring to fall of 2009 in the GCR Audio studio in Buffalo and Paramount Studios as well as "the Ark" in Los Angeles, with producer Tim Palmer.  A single had been originally slated to be released in November 2009 with an album release in February 2010, but the band went back into the studio in January 2010.  According to lead singer and guitarist John Rzeznik, this was done to make further improvements on what they had previously thought had been a finished record.  Several producers were brought in to assist on the production process, including Butch Vig, John Fields, Paul David Hager and Rob Cavallo.  "Something for the Rest of Us" is the third Goo Goo Dolls studio album that Cavallo has produced ("Dizzy Up the Girl" and "Gutterflower").  When asked about the length of time between albums, Rzeznik admitted it was a mix of songwriting issues as well as taking time out for personal reasons; "I wanted to really dig deep and there are a million songs I threw away, like, “Nah, it's not good enough.  I wanna do something different.  I wanna do something better, go deeper.  I also wanted to have a life with my girlfriend for a while.  I owed it to her to spend some time with her and be normal and be in one place.  That was kind of important."  In one of the Ustream sessions, Robby revealed that the album would have twelve songs and "Real" is not among them.  In late May, John announced that "Home" would be the first single and was released onto radio and iTunes stores on June 8, 2010. "Sour Suite" is a song written by Burton Cummings and performed by The Guess Who.  It reached #12 in Canada and #50 on the "Billboard" Hot 100 in 1972.  The song was featured on their 1971 album, "So Long, Bannatyne".  Cummings said it took between two and three days to write the song.  Its lyric about being "back in 46201" refers to the zip code for Indianapolis.  Cummings took it from the return address of a letter sent to him by a female fan. Live at the Burton Cummings Theatre is a live album and concert DVD by Canadian indie rock band The Weakerthans.  The album was recorded during April 2009 at the Burton Cummings Theatre in the band's home town of Winnipeg, as they toured in support of their album "Reunion Tour".  It was released March 23, 2010 on ANTI-. First Time Around is a one-disk DVD by Randy Bachman and Burton Cummings recorded in 2006 at CBC Studios in Toronto, Ontario by CBC.  First Time Around was originally featured on CBC in April 2006, but was later released as a DVD featuring extended footage of the concert.  The concert features 20 tracks of songs by Bachman-Turner Overdrive, Burton Cummings, The Guess Who and covers of artists such as Sting and Jimi Hendrix. Burton Lorne Cummings, {'1': ", '2': ", '3': ", '4': "} (born December 31, 1947) is a Canadian musician, singer and songwriter. Jukebox is a studio album from Canadian rock musicians Randy Bachman and Burton Cummings, performing together under the name "The Bachman-Cummings Band".  It was released on Sony BMG on June 12, 2007.  The album features cover versions of songs from the 1960s that Bachman and Cummings listened to while growing up in Winnipeg, Manitoba.  Bachman and Cummings are backed on the album by the Canadian band The Carpet Frogs. John Joseph Theodore Rzeznik ( ; born December 5, 1965) is an American musician, singer-songwriter, and producer.  He is best known as the guitarist and frontman of the rock band the Goo Goo Dolls, of which he is a founding member and with whom he has recorded eleven studio albums. Jed is the second studio album by American rock band Goo Goo Dolls.  It is the first studio album in which John Rzeznik sang vocals for some of the tracks.  The majority of the songs are sung by Robby Takac, with Rzeznik taking over for two ("Up Yours" and "James Dean").  Fellow Western New York native Lance Diamond sings vocals on track seven, "Down On The Corner."  The second track on the album, "Up Yours", was the only song from "Jed" found on the band's compilation album "What I Learned About Ego, Opinion, Art & Commerce".  The song "No Way Out" was also included on the band's most recent compilation album "Volume Two", which consisted of other album tracks, b-sides and rarities.  The album was re-released on CD on February 22, 1994.
Answer: musician, singer and songwriter