Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1800 - 1932 1933 - 1995 1996 - 1999 2000 - 2003 2004 - 2008 perfect pitch English
1800 - 1891 1892 - 1930 1931 - 1937 1938 - 1985 1986 - 2008 absolute pitch English

Run your own experiment! Raw data is available for download here.
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