concatenating/converting string variables ?

[Paul Malcolm]

excuse me, just a trivial question, but I cannot seem to find the answer. 

I want to add the date variable to one element of text in my title.

I have this in the preamble

date = #(strftime "%d-%m-%Y" (localtime (current-time)))

What I want to do is somehow add/concatenate this to a text string 

for the name of person doing the arranging, which appears in the 

header block, i.e.

arranger = "Arr.  Maestro Smithington-Smythe"  

How do I do this so I finally see 

  Arr. Maestro Smithington-Smythe, 17/May/2013

?