What is the meaning of the number in brackets in a song after the number of readings of this song?
It the number of readings today.
However I've noticed that it sometime goes back to zero on the same day that I've posted something which should be impossible. But I expect it's something to do with timezones.
The "day" here has a fixed start, and is not like "in the last 24 hours". It starts around 16:00(winter)/17:00(summer) in the GMT+3 zone.
Ah, that explains it.