Google Ngram Viewer
N-gram is defined as "contiguous sequence of n items from a given sequence of text or speech... can be phonemes, syllables, letters, words or base pairs" in Wikipedia.
GoogleBooks n-gram application will display "the annual popularity of any published word or phrase over the last several centuries." (nytimes)
I searched 4 composers: Bach, Beethoven, Debussy, Tchaikovsky. Below the graph, you will see links of search results broken down to different eras.
Mousing over the data points, there seemed to be a spike for these composers in 1946:
Case-sensitive names display different results (which kind of makes sense because the data is from books, not other media):
You can use "+" to combine case-sensitive terms (in this case I combined "dna+DNA, cancer+Cancer, gene+Gene."