Singer last played 'Bedtime Stories' cut in 1995
The incident took place at the pop singer's show in Nashville last night
Singer denies speculation surrounding recent concert in Louisville, Kentucky
Madonna performed the cover in Houston on Tuesday night
The US pop star has been posting festive social media messages
Singer blames organisers at SSE Hydro as technical problems hit her 'Rebel Heart' tour again
Singer has given evidence in a defamation case against 'Empire' TV show co-creator
Singer labelled her fans 'bitches' for complaining about her being a hour late
Singer blamed technical difficulties for the long delay
Singer covered John Lennon's 'Imagine' during acoustic mini-set