Audio makes my slide show too long

This is my first time using Encore. I am trying add a simple slideshow onto my
dvd but i am having problems when adding music. The slideshow lasts only a min
but when i add the music the slideshow lasts for the whole of the song, even tho
the pictures end way before. Just leaving 2 mins of black screen. Is there a way
to stop this, or do i just have to use pro tools, which i dont have at the
moment, to shorten the music track. I was hoping for a quickfix that doesnt
involve another programme i have to indtall seing as i am formatting my hard
drive tommorow anyway.

Choose the selection tool(black arrow). Move to the end of the audio track. The
arrow will turn into a red ]. Hold down the left mouse button and move the end
point of the audio to the desired spot.