Were the two parts written concurrently, or one after the other?

The two were written concurrently, and the book quotes lyrics from several of the songs.

Remarkably, the first four novels had been written concurrently.

The first rule ensures that a data item is not read and written by two transactions concurrently.

In the most literal narrative sense, as found in the concurrently written novel, the Monolith is a tool, an artifact of an alien civilization.

The songs and the book were written concurrently, and several of the songs are quoted in the book and its sequel.

The book and album were written concurrently; Barnes quotes song lyrics in the book.

However, the work had to be written concurrently with her regular duties as the Herald correspondent and other press commitments.

Disadvantages include slower write performance than a single disk and bottlenecking when multiple drives are written concurrently.

The third work of fiction in this period, written concurrently with the non-fiction Terry, is another re-envisioning of a previous book.