In 2003, she took the stage during the Howard Jones 20th Anniversary concert at the Shepherd's Bush Empire in London to sing "99 Luftballons", with both German and English lyrics. In 2004, Nena went on stage at the Mayday Music Festival in Dortmund, accompanied by the techno duo Toktok. She sang the song "Bang Bang", and was later joined on stage by DJ Westbam to perform "Oldschool Baby". In March 2015, Nena promoted the release of the "Oldschool" album with a "club tour" of 16 smaller venues (for 200 to 700 people) including her former primary school. A recording of one of these concerts at the SO36 club in Berlin on 4 March 2015 was released as Nena's sixth live album "Live at SO36" on 4 March 2016, exactly one year later. Later in 2015, Nena announced her intention to perform live in the US for the first time by way of a similar "club tour", which was initially planned for early 2016 before taking place as a three-date "mini tour" in September and October. During this tour, Nena met Dave Stewart with whom she collaborated to release in March 2018 the single "Be my rebel", the video for which went on to win 40 international awards.