'Push (Feel Good on a Wednesday)' is sung by Sia
Musicians Jaden Smith and Becky G also appear on the list alongside figures from world of sport, politics and science
Singer reveals amusement at recent episode in which she was 'revealed' to be 45-year-old geologist Randy Marsh
Singer says being subject of two episodes is 'weird and cool'
New single is taken from the soundtrack to forthcoming 'Hunger Games' sequel
'Yellow Flicker Beat' will be released next week
5 Seconds of Summer and Earl Sweatshirt also feature on the list
The song is her first new material since last year's 'Pure Heroine'
Teenage singer performs 'Flashing Lights' and 'Heavenly Father' live
New single described as "moody, dark and powerful" by recording studio owner