Question: who is the present mayor of the city where the band that performed Brother was formed in?

<P0-S0> the administration of london is formed of two tiers—a city-wide, strategic tier and a local tier. <P0-S1> city-wide administration is coordinated by the greater london authority (gla), while local administration is carried out by 33 smaller authorities. <P0-S2> the gla consists of two elected components; the mayor of london, who has executive powers, and the london assembly, which scrutinises the mayor's decisions and can accept or reject the mayor's budget proposals each year. <P0-S3> the headquarters of the gla is city hall, southwark; the mayor is boris johnson. <P0-S4> the mayor's statutory planning strategy is published as the london plan, which was most recently revised in 2011. the local authorities are the councils of the 32 london boroughs and the city of london corporation. <P0-S5> they are responsible for most local services, such as local planning, schools, social services, local roads and refuse collection. <P0-S6> certain functions, such as waste management, are provided through joint arrangements. <P0-S7> in 2009–2010 the combined revenue expenditure by london councils and the gla amounted to just over £22 billion (£14.7 billion for the boroughs and £7.4 billion for the gla). <SEP> <P1-S0> "Brother" is a song by the American rock band Pearl Jam. <P1-S1> Featuring lyrics written by vocalist Eddie Vedder and music written by guitarist Stone Gossard, "Brother" was an outtake from the band's debut album, "Ten". <P1-S2> The song was included as an instrumental version on the 2003 B-sides and rarities album, "Lost Dogs". <P1-S3> The version of "Brother" with vocals appears on the 2009 "Ten" reissue. <P1-S4> The version of the song with vocals was released to radio in 2009, however a commercial single was not released. <P1-S5> The song topped the "Billboard" Modern Rock Tracks chart, where it spent a total of two weeks at number one. <SEP> <P2-S0> guarda () is a city and a municipality in guarda district, beira interior norte sub-region in centro region in portugal. <P2-S1> the population in 2011 was 42,541, in an area of 712.10 km². <P2-S2> the city of guarda was founded by king sancho i in 1199. the present mayor is álvaro amaro, who succeeded joaquim valente. <P2-S3> the municipal holiday is november 27. <SEP> <P3-S0> Pearl Jam is an American rock band formed in 1990 in Seattle, Washington. <P3-S1> The band's current lineup comprises founding members Eddie Vedder (lead vocals), Mike McCready (lead guitar), Stone Gossard (rhythm guitar) and Jeff Ament (bass), and longtime drummer Matt Cameron. <P3-S2> Keyboardist Boom Gaspar has also been a session/touring member with the band since 2002. <P3-S3> Drummers Jack Irons, Dave Krusen, Matt Chamberlain and Dave Abbruzzese are former members of the band. <SEP> <P4-S0> Like most parts of the United States, government and laws are also run by a series of ballot initiatives (allowing citizens to pass or reject laws), referenda (allowing citizens to approve or reject legislation already passed), and propositions (allowing specific government agencies to propose new laws/tax increases directly to the people). <P4-S1> Federally, Seattle is part of Washington's 7th congressional district, represented by Democrat Jim McDermott, elected in 1988 and one of Congress's liberal members. <P4-S2> Ed Murray is currently serving as mayor.