[PAR] [TLE] George Martin [SEP] Sir George Henry Martin {'1': ", '2': ", '3': ", '4': "} (3 January 19268 March 2016) was an English record producer, arranger, composer, conductor, audio engineer, and musician.  He was referred to as the "Fifth Beatle", including by Paul McCartney, in reference to his extensive involvement on each of the Beatles' original albums.  Martin produced 30 number-one hit singles in the United Kingdom and 23 number-one hits in the United States. [PAR] [TLE] Harbor (album) [SEP] Harbor is the seventh original studio album by American folk rock trio America, released by Warner Bros.  Records in February 1977.  It was the last to feature Dan Peek, who embarked on a solo Christian career shortly after the album's release.  The album was produced by George Martin.
[PAR] [TLE] George Martin [ SEP ] Sir George Henry Martin { ' 1 ' : " , ' 2 ' : " , ' 3 ' : " , ' 4 ' : " } ( 3 January 19268 March 2016 ) was an English record producer , arranger , composer , conductor , audio engineer , and musician . He was referred to as the " Fifth Beatle " , including by Paul McCartney , in reference to his extensive involvement on each of the Beatles ' original albums . Martin produced 30 number - one hit singles in the United Kingdom and 23 number - one hits in the United States . [PAR] [TLE] Harbor ( album ) [ SEP ] Harbor is the seventh original studio album by American folk rock trio America , released by Warner Bros. Records in February 1977 . It was the last to feature Dan Peek , who embarked on a solo Christian career shortly after the album 's release . The album was produced by George Martin .
How many number-one hit singles in the US did the producer of the album Harbor produce?
How many number - one hit singles in the US did the producer of the album Harbor produce ?
23
23