Comedy night will launch the charity's series of live gigs with New Order and more in April
Andrew Tkaczyk had his right leg amputated under the knee
The musician appeared on French TV show 'Le Grande Journal'
Obama will deliver a keynote speech at the Austin, Texas festival on Friday (March 11)
The annual event takes place this year on April 16
Haim, La Roux, MIA and more also appear on the Spotify set