Out duo has two-night stint planned in Annapolis
Baltimore’s diverse art scene celebrated
video honors 49 lives lost in tragedy
Lin-Manuel Miranda joined the pop star on stage
video is part of visual album 'Straight Outta Oz'
Adam Lambert, Britney Spears and more lend vocals
all proceeds from track will be donated to charity
the pair were joined by singer Andra Day
pop star remembered tragedy with song "Purpose"
Olly Alexander says video has 'magical queer creative energy'