The Smithsonian’s National Zoo hosted a free concert, featuring Portugal. The Man Monday, in an effort to draw awareness to the diminishing number of Sumatran Tigers. The band has been promoting its #EndangeredSong project via social media, as a way for fans to partake in the cause.

Vocalist John Gourley plays a number of tunes including the band’s “Endangered Species” song. (Sung-Min Kim/ For The Bloc)

Bassist Zachary Carothers and drummer Jason Sechrist are pictured here as the band plays mash-ups featuring songs like “Hey Jude” and “Live and Let Die.” (Sung-Min Kim/ For The Bloc)

Keyboardist Kyle O’Quin is featured here during the concert, which lasted roughly an hour. (Sung-Min Kim/ For The Bloc)

The band released only 400 vinyl records of the song to symbolize the roughly 400 Sumatran Tigers left in the wild. (Sung-Min Kim/ For The Bloc)

The band asked fans who receive the record to digitize and share them with others. (Sung-Min Kim/ For The Bloc)

Portugal. The Man is a psychedelic rock group from Wasilla, Alaska. (Sung-Min Kim/ For The Bloc)

Roughly 500 people attended the free event. (Sung-Min Kim/ For The Bloc)

The band’s most recent album, “Evil Friends,” features the popular song “Purple Yellow Red & Blue.” (Sung-Min Kim/ For The Bloc)

Police forcibly removed a fan after he refused to stay seated. (Sung-Min Kim/ For The Bloc)

One fan, 23-year-old D.C. resident Dany Martinez, makes his way toward the stage. (Sung-Min Kim/ For The Bloc)

Despite breaking the rules, Martinez is welcomed to stay by Gourley. (Sung-Min Kim/ For The Bloc)

To avoid a repeat of the earlier incident, Gourley allows Martinez to stay. (Sung-Min Kim/ For The Bloc)

Martinez performs with the band until the end of the set. (Sung-Min Kim/ For The Bloc)

Photo cutlines by Bloc Reporters Iman Smith and Jin Kim.