How can I change an imported audio file into concert pitch

I have imported into my Sonar X1 some old recordings made when guitar tuners were not readily available so our guitars were not in concert pitch. Consequently I am unable to add some sync sounds, in concert pitch, to the old recording. Is there any easy way to identify the pitch of the audio and then change it to concert pitch? 

If this is just one or two guitars, or if the instruments are on separate tracks, Melodyne (polyphonic) would help and you could raise it all to concert pitch.
 
If several instruments are mixed, I would take a tone (like one output from a tuner) and vary it until it sounded in tune and then read the frequency.  With that information, you could either (a) tranpose the whole track or (b) tune your new instruments to the target frequency.  I think (b) would sound better.
 
Someone may know of a tool that does the analysis you are requesting automatically but I do not.
 
Just as a historical note: I used to put a tone or piano note at the first of a two-inch (24-track) master tape in case we ever had to tune to it later, or use varispeed to get it in tune with a piano or organ.  Ask me if I miss those days...what a pain

+1 on the detuning the synths. Every half decent synth has a fine tuning knob. 

To clarify, I’m a relative beginner with Sonar and still struggling to get the basics.  The audio track I have imported is mixed instruments (6 string and 12 string guitars and 2 vocalists). CJ and Konrad, I think the Melodyne DNA is streets beyond me, but sounds really useful for serious musicians.  The answer for me is detuning the synth which I knew nothing about previous to this query so thanks Bristol Jonesy and Sharkey. Regarding your PS Sharkey, who is Buzzcocks and his videos? The only Buzzcocks I know of is the Punk Band, still performing I believe. 

Alan in Cram
Regarding your PS Sharkey, who is Buzzcocks and his videos? The only Buzzcocks I know of is the Punk Band, still performing I believe. 

Ha sorry about that Alan, I guess I thought Buzzcocks was a bigger star than he really was. He was a cult chav character on YouTube and as funny as hell. All set in Cramlington. And then one day all of his videos disappeared without trace, the man behind them having taken them all down. They're still uploaded in various places though.