Chart facts as streaming introduced
From next month if a song is streamed online it'll count towards the track's chart position.
The Official Charts Company, who compile the UK charts, say the move is to reflect how people are now consuming music.
Only audio streams are being counted.
A song must be played for a minimum of 30 seconds on Spotify, Deezer, Napster, O2 Tracks, Music Unlimited, Zune or Rara.
This is being seen as the most significant change to the charts make-up since downloads were included 10 years ago.
Take a look at some of the tracks that have made chart history.
Most number ones
Elvis Presley has a total of 21 number one singles in the UK.
His first came in June 1957 with All Shook Up and his most recent was 2002's A Little Less Conversation by Elvis vs JXL.
Longest running number one
In July 1991 Bryan Adams scored his first number one with (Everything I Do) I Do It For You.
The track was still at the top of the charts in November of the same year having set a record-breaking 16 week run at number one.
In September 1994 Whigfield's Saturday Night became the first debut single to enter at the top 40 at the number one.
Bastille's Pompeii, which peaked at number two in the official singles chart, is the most streamed track of all time.
The track is taken from the band's debut album Bad Blood which spent three weeks at number one in 2013.
The one that got away
Wham!'s Last Christmas, which was released in 1984, is the biggest selling single of all-time to have never reached number one.
Despite selling 500,000 copies in one week, the track was still beaten to the top spot by Band Aid's Feed The World.