Originally Posted by BeeBumble:
“To be honest I think people have just assumed Argentine Tango was classed as ballroom in terms of SCD because most of the time it's done in the semi-final it's happened to be paired with a Latin dance but there has been times it hasn't and there has been plenty of times where it's been done inbetween two ballroom dances.”
It was performed only in semi-finals between series 4 and 7, paired with a ballroom dance 8 times and with a latin dance 4 times.
From series 8 onwards, it was introduced earlier in the series, along with charleston. Even though both are 'speciality' styles (so are salsa and American smooth, to be honest), to keep the numbers even, charleston is generally lumped in with 'latin' and Argentine tango with 'ballroom'. Since then, the only person to do Argentine tango with another ballroom dance in the semi-final is Dani Harmer (and that's arguably due to the last-minute change to make it a 4-couple final - most people at the time assumed they'd save it to be their 'new' dance in the final, before the format changed).