However, the traditional vocal adaptation composed by Alberto Nepomuceno was so well established by the time it became official that the interpretations of the national anthem that depart from the official orchestration or from the official vocal adaptation are few. Indeed, although other arrangements are now allowed, the traditional form tends to prevail, so that, with few exceptions, even celebrity singers tend to only lend their voices to the singing of the official vocal adaptation by Alberto Nepomuceno. The anthem is sung in Brazil's official national language, the Portuguese language. Lyrics The song consists of two consecutive stanzas. The adoption in 1922 of lyrics containing two stanzas thus created the present situation of the music of the anthem being played twice so as to allow for the singing of both stanzas. Brazilian law stipulates that the music needs to be played only once in instrumental renditions of the anthem without vocal accompaniment (thus, in instrumental renditions without vocal accompaniment, the playing of the music twice is optional), but both stanzas must be sung in vocal performances. The second stanza is often dropped when played at sporting events, as most renditions of the Brazilian National Anthem for sporting events are instrumental and not vocal. In the lyrics, the opening line's mention of the Ipiranga river refers to the stream near (and now part of) the city of São Paulo where Prince Dom Pedro, the future Emperor Dom Pedro I of Brazil, declared Brazilian independence from Portugal. (*) The passages in quotation marks were extracted from Gonçalves Dias' poem "Canção do exílio". See also "Brazilian Flag Anthem" () "Brazilian Anthem of Independence" () "Brazilian Republic Anthem" () Notes References External links Hinos at the Brazilian Government 50,000 sing the anthem at FIFA World Cup 2014, partly a capella Brazil National symbols of Brazil Portuguese-language songs National anthem National anthems National anthem compositions in F major 1831 songs