ad lib vs take it as it comes

ad lib

adj

Extemporaneous, impromptu.

adv

Extemporaneously.
At will.
To whatever extent.
At pleasure.

verb

To perform without preparation.
To perform without script.
To perform extemporaneously.

take it as it comes

How often have the words ad lib and take it as it comes occurred in a corpus of books? (source: Google Ngram Viewer )