Short answers, pulled from the story.
The Spice Girls released their debut single Wannabe on the 8th of July 1996 in the United Kingdom. The song entered the UK Singles Chart at number three and spent seven weeks at number one before hitting number one in thirty-seven countries.
Emma Bunton replaced Michelle Stephenson after Stephenson left following a few months due to perceived lack of commitment. Vocal coach Pepi Lemer recommended Bunton for the role during the group's early development phase.
The Spiceworld Tour began on the 24th of February 1998 and grossed between $220 million and $250 million across ninety-seven shows. The Return of the Spice Girls Tour concluded in Toronto on the 26th of February 2008 generating $107.2 million in ticket sales and merchandising.
The Spice Girls used dance-pop as a musical base while infusing it with a fiercely independent feminist stance described by AllMusic as equal parts Madonna and post-riot grrrl alternative rock feminism. They shared vocals among five voices rather than having one lead singer supported by others.
Geri Halliwell announced her departure through her solicitor on the 31st of May 1998 after missing concerts in Norway and appearing absent from a performance on The National Lottery Draws. She cited creative differences and exhaustion as reasons for leaving though rumors of a power struggle with Melanie Brown circulated widely.