In FORUMDISPLAY template locate <div id="above_threadlist" ..........
Locate "{vb:rawphrase post_new_thread}" and replace it with
HTML Code:
<vb:if condition="$foruminfo['forumid']==28"> {vb:rawphrase post_new_song}<vb:else /> {vb:rawphrase post_new_thread}</vb:if>
Now locate <div id="below_threadlist" ..... and do the same.
Haven' t tested this so if it doesn't work and you need to restore it be sure there is a space in front of {vb:rawphrase post_new_thread}