Recently, this was changed to over 30 minutes of songs with a certain theme.

And he often chooses companies that should fit certain themes for the next three to five years.

But certain themes - including the need to do the right thing - are timeless in business writing.

Some parts of the country seem to specialize in certain themes.

They show an enormous variety within which certain common themes can be noticed.

The workshop lasts for 8 or 9 days and always has a certain theme.

Looking back, we can see that certain themes permeated the media from 1943 through 1945.

"We just know we have a certain theme to work with."

If the read the entire programme, as we hope you will, you'll find certain themes emerging.

"There are certain themes that fascinate me and I keep going back to them," she said.