20,000 people attended a free concert in support of Taiwan becoming the first Asian nation to legalize same-sex marriage on Sunday.

The concert was held by Taiwanese pop star A-mei who not only performed for free but picked up the cost of holding the concert which was over US$100,000.

A-mei is the first and most high profile Taiwanese celebrity to back the campaign to legalize same-sex marriage in Taiwan and performed 22 acoustic songs during the concert, which she began with her hit song ‘Sisters.’

People reportedly lined up for hours to make sure they got into the concert, with many bringing rainbow LGBTI pride flags with them – a motive also used by A-mei in the concert’s lighting and stage design.

‘We are here today to let everyone, including our parents, know about our love,’ A-mei told the audience, according to Focus Taiwan.

‘Today, show your love generously.’

A-mei said she had three points to make through the concert.

‘First, respect love,’ A-mei said.

‘Second, respect everyone’s love. Third, support true love.’

A draft of a bill to allow same-sex couples to marry and adopt passed its first reading in Taiwan’s Legislative Yuan in October but thousands of opponents took to the streets to protest it last year.

Watch fan footage of the concert below