Some context: Michael Anthony Sobolewski (born June 20, 1954 and legally shortened his name to Michael Anthony in 1978), is an American musician who is currently the bass player in the rock supergroup Chickenfoot and the Circle. Anthony is best known as the former bass player for the hard rock band Van Halen. Anthony is known for his stage antics, his effects-laden live solos, his number of custom-made bass guitars, including a Jack Daniel's model shaped like a whiskey bottle, and his background vocals in Van Halen. He also has a signature Schecter Guitar Research bass-guitar series.
While Anthony was a promising catcher in baseball, he also competed on the Dana Junior High School track team (long jump) and played in the marching band there from 1967-1969. He took an interest in guitar as a teenager, but picked up the bass instead since most of his other friends already played guitar or drums. Anthony's friend Mike Hershey gave him a Fender Mustang electric guitar that Anthony converted by removing the two highest strings and playing it as a bass guitar. Eventually, his father bought him a Victoria copy of a Fender Precision Bass and a Gibson amplifier. Anthony mostly modelled his bass playing after Jack Bruce of Cream, but also admired Led Zeppelin's John Paul Jones and Harvey Brooks of Electric Flag. His first band was called Poverty's Children. Other bands he played in included Black Opal, Balls, and Snake. Although Anthony is naturally left-handed, he plays right-handed.  Snake, a three-piece group featuring Anthony on lead vocals and bass guitar, was the last band in which Anthony played before joining Van Halen. Snake played covers of ZZ Top, Lynyrd Skynyrd, and Foghat, along with some original songs. They played several of the same types of gigs as did the Van Halen brothers' band Mammoth. Snake even once opened for Mammoth at a show at Pasadena High School. Mammoth's PA failed that night, so Anthony lent them Snake's PA.  While attending Pasadena City College, Anthony pursued a degree in music. Eddie Van Halen also took classes there and they would often see each other on campus. During this time, bass player Mark Stone parted ways with Mammoth and the Van Halens decided to audition Anthony as a replacement. Anthony was impressed by their skill during subsequent jam sessions even though he had seen the brothers play before. After the session, the Van Halen brothers asked Anthony to join their band. One story claims that he said he had to think about it and consulted Snake guitarist Tony Caggiano who advised Anthony to join Van Halen. However, according to Michael Anthony's web site, when asked if he wanted to join Mammoth, Anthony immediately said yes. This has become the accepted version of events.
why did he decide to leave the band he was with and join Van Halens?
A: During this time, bass player Mark Stone parted ways with Mammoth and the Van Halens decided to audition Anthony as a replacement.

Some context: Mumtaz Mahal (Urdu: mumtz mHal ), ([mum'ta:z me'hel]; meaning "the Exalted One of the palace"; Arjumand Banu; 27 April 1593 - 17 June 1631) was Empress consort of the Mughal Empire from 19 January 1628 to 17 June 1631 as the chief consort of the Mughal emperor Shah Jahan. The UNESCO World Heritage Site Taj Mahal in Agra, often cited as one of the Wonders of the World, was commissioned to act as her final resting place. Mumtaz Mahal was born Arjumand Banu Begum in Agra to a family of Persian nobility.
Mumtaz Mahal was betrothed to Shah Jahan around 30 January 1607, when she was 14 years old at the time and he was 15. They were, however, married five years after the year of their betrothal on 30 April 1612 in Agra. The marriage was a love-match. After their wedding celebrations, Shah Jahan, "finding her in appearance and character elect among all the women of the time", gave her the title "Mumtaz Mahal" Begum ("the Exalted One of the Palace"). During the intervening years between their betrothal and marriage, Shah Jahan had gotten married to his first wife, Princess Kandahari Begum in 1609 and in 1617, after marrying Mumtaz, took a third wife, Izz-un-Nissa Begum (titled Akbarabadi Mahal), the daughter of a prominent Mughal courtier. According to the official court historians, both the marriages were political alliances.  By all accounts, Shah Jahan was so taken with Mumtaz that he showed little interest in exercising his polygamous rights with his two other wives, other than dutifully siring a child with each. According to the official court chronicler, Motamid Khan, as recorded in his Iqbal Namah-e-Jahangiri, the relationship with his other wives "had nothing more than the status of marriage. The intimacy, deep affection, attention and favour which Shah Jahan had for Mumtaz exceeded what he felt for his other wives." Likewise, Shah Jahan's historian Inayat Khan commented that 'his whole delight was centered on this illustrious lady [Mumtaz], to such an extent that he did not feel towards the others [i.e. his other wives] one-thousandth part of the affection that he did for her.'  Mumtaz had a loving marriage with Shah Jahan. Even during her lifetime, poets would extol her beauty, grace, and compassion. Despite her frequent pregnancies, Mumtaz travelled with Shah Jahan's entourage throughout his earlier military campaigns and the subsequent rebellion against his father. She was his constant companion and trusted confidant, leading court historians to go to unheard lengths to document the intimate and erotic relationship the couple enjoyed. In their nineteen years of marriage, they had fourteen children together (eight sons and six daughters), seven of whom died at birth or at a very young age.
When did she marry?
A:
30 April 1612