I would like to know the song title and artist currently used on the
national television advertisement for the town of Brisbane

Dear clare1007-ga,

From your description I assume you mean this advertisment.
Select your internet speed and then click the play button.
http://www.ourbrisbane.com/visitors/experiencebrisbane/media/

The song is Save Tonight by Eagle-Eye-Cherry. Here are the lyrics.
http://www.eagle-eye-cherry.com/lyrics/savetonight.html

It appears on the Desireless album. You can download an extract here.
http://www.eagle-eye-cherry.com/music.html


I hope I have correctly identified the advertisement. If I have not
then please ask for clarification of this research before rating the
answer. I shall respond to the clarification request as soon as I
receive it.
Thank you
answerfinder


Search strategy
brisbane "television advertisement" led me to the tourist web site
where I identified the commercial and the lyrics. Then searched on the
lyrics.

absolutely brilliant, I expected a short and sweet answer instead I
got complete and concise information.  Thank you for your time and
help

Dear clare1007-ga,
Thank you for the tip. Pleased I could help.
answerfinder-ga