 The score was composed by Gray , who served as musical director for all of the Anderson productions up to the first series of Space : 1999 . In response to Gerry Anderson 's request that the main theme have a " military feel " , Gray produced a brass @-@ dominated piece titled " The Thunderbirds March " , which was recorded in December 1964 at Olympic Studios in London . The end titles were originally to have been accompanied by " Flying High " , a lyrical track sung by Gary Miller with backing by Ken Barrie . Ultimately , a variation of the march was used instead . Incidental music was recorded over nine months between March and December 1965 . As most of the music budget was spent on the series ' earlier episodes , later instalments drew heavily on APF 's ever @-@ expanding music library . 
 The score was composed by Gray , <a href='null_relcl' title='1'><mark>who</mark></a>served as musical director for all of the Anderson productions up to the first series of Space : 1999 . In response to Gerry Anderson <a href='null_genetive' title='2'><mark>'s</mark></a>request that the main theme <a href='got' title='3'><mark>have</mark></a> a " military feel " , Gray produced a brass @-@ dominated piece titled " The Thunderbirds March " , which was recorded in December 1964 at Olympic Studios in London . The end titles <a href='uninflect' title='4'><mark>were</mark></a> originally to <a href='been_done' title='5'><mark>have</mark></a> been accompanied by " Flying High " , a lyrical track sung by Gary Miller with backing by Ken Barrie . Ultimately , a variation of the march was used instead . Incidental music was recorded over nine months between March and December 1965 . As most of the music budget was spent on the series <a href='null_genetive' title='6'><mark>'</mark></a>earlier episodes , later instalments drew heavily on APF <a href='null_genetive' title='7'><mark>'s</mark></a>ever @-@ expanding music library . 
Da score was composed by Gray , served as musical director for alll of tdaAnderson productions up to the first series of Space : 1999 . In response to Gerry Anderson  request dat thdaain theme got a " military feel " , Gray produced a brass @-@ dominated piece titled " Thedaunderbirds March " , which was recorded in December 1964 at Olympic Studios in London . The end titles was originally to done been accompanied by " Flying High " , a lyrical track sung by Gary Miller wid backing by Ken Barrie . Ultimately , a variation of the march was used instead . Incidental music was recorded ova nine months between March and December 1965 . As most of the music budget was spent on the daies  earlier episodes , later instalments drew heavily on APF  ever @-@ expanding music library .