Some context: Aerosmith is an American rock band, sometimes referred to as "the Bad Boys from Boston" and "America's Greatest Rock and Roll Band". Their style, which is rooted in blues-based hard rock, has come to also incorporate elements of pop, heavy metal, and rhythm and blues, and has inspired many subsequent rock artists. They were formed in Boston, Massachusetts, in 1970. Guitarist Joe Perry and bassist Tom Hamilton, originally in a band together called the Jam Band, met up with vocalist/pianist/harmonicist Steven Tyler, drummer Joey Kramer, and guitarist Ray Tabano, and formed Aerosmith.
In 1964, Steven Tyler formed his own band called the Strangeurs--later Chain Reaction--in Yonkers, NY. Meanwhile, Perry and Hamilton formed the Jam Band (commonly known as "Joe Perry's Jam Band"), which was based on free-form and blues. Hamilton and Perry moved to Boston, Massachusetts in September 1969. There they met Joey Kramer, a drummer from Yonkers, New York. Kramer knew Tyler and had always hoped to play in a band with him. Kramer, a Berklee College of Music student, decided to quit school to join Jam Band.  In 1970, Chain Reaction and Jam Band played at the same gig. Tyler immediately loved Jam Band's sound, and wanted to combine the two bands. In October 1970, the bands met up again and considered the proposition. Tyler, who had been a drummer and backup singer in Chain Reaction, adamantly refused to play drums in this new band, insisting he would take part only if he could be frontman and lead vocalist. The others agreed, and a new band was born. The band moved into a home together at 1325 Commonwealth Avenue in Boston, where they wrote and rehearsed music together and relaxed in between shows.  The members of the band reportedly spent afternoons getting stoned and watching Three Stooges reruns. One day, they had a post-Stooges meeting to try to come up with a name. Kramer said when he was in school he would write the word aerosmith all over his notebooks. The name had popped into his head after listening to Harry Nilsson's album Aerial Ballet, which featured jacket art of a circus performer jumping out of a biplane. Initially, Kramer's bandmates were unimpressed; they all thought he was referring to the Sinclair Lewis novel they were required to read in high school English class. "No, not Arrowsmith," Kramer explained. "A-E-R-O...Aerosmith." The band settled upon this name after also considering "the Hookers" and "Spike Jones."  Soon, the band hired Ray Tabano, a childhood friend of Tyler, as rhythm guitarist and began playing local shows. Aerosmith played their first gig in Mendon, Massachusetts at Nipmuc Regional High School (now Miscoe Hill Middle School) on November 6, 1970. In 1971, Tabano was replaced by Brad Whitford, who also attended the Berklee School of Music and was formerly of the band Earth Inc. Whitford, from Reading, Massachusetts, had already played at Reading's AW Coolidge Middle School. Other than a period from July 1979 to April 1984, the line-up of Tyler, Perry, Hamilton, Kramer, and Whitford has stayed the same.
When did Aerosmith form?
A: In 1964, Steven Tyler formed his own band called the Strangeurs--later Chain Reaction--in Yonkers, NY.

Some context: The Electric Light Orchestra (ELO) are an English rock band formed in Birmingham in 1970, by songwriters/multi-instrumentalists Jeff Lynne and Roy Wood with drummer Bev Bevan. Their music is characterised by a fusion of Beatlesque pop, classical arrangements, and futuristic iconography. After Wood's departure in 1972, Lynne became the band's leader, arranging and producing every album while writing virtually all of their original material. For their initial tenure, Lynne, Bevan and keyboardist Richard Tandy were the group's only consistent members.
For the next six years, Harvest and Epic/Legacy reissued ELO's back catalogue. Included amongst the remastered album tracks were unreleased songs and outtakes, including two new singles. The first was "Surrender" which registered on the lower end of the UK Singles Chart at number 81, some 30 years after it was written in 1976. The other single was "Latitude 88 North".  On 9 August 2010, Eagle Rock Entertainment released Live - The Early Years in the UK as a DVD compilation that included Fusion - Live in London (1976) along with never before released live performances at Brunel University (1973) and on a German TV show Rockpalast (1974). The US had a slightly edited release on 24 August 2010. The Essential Electric Light Orchestra artwork was re-jigged to feature two different covers. The US and Australian releases shared one design, while the rest of the world featured the other for a new double album release in October 2011.  Mr. Blue Sky: The Very Best of Electric Light Orchestra was released on 8 October 2012. It is an album of new recordings of ELO's greatest hits by Lynne; along with a new song "Point of No Return", released to coincide with Lynne's second solo album release Long Wave. These new 2012 albums contained advertisement cards, announcing the re-release of expanded and remastered versions of both the 2001 album Zoom and Lynne's debut solo album Armchair Theatre, originally released in 1990. Both albums were re-released in April 2013 with various bonus tracks. Also released was the live album, Electric Light Orchestra Live, showcasing songs from the Zoom tour. All three releases also featured new studio recordings as bonus tracks.  Lynne and Tandy reunited again on 12 November 2013 to perform, under the name Jeff Lynne and Friends, "Livin' Thing" and "Mr Blue Sky" at the Children in Need Rocks concert at Hammersmith Eventim Apollo, London. The backing orchestra was the BBC Concert Orchestra, with Chereene Allen on lead violin.
What did they perform?
A:
"Livin' Thing" and "Mr Blue Sky"