The phrase "a compilation of mostly" is correct and usable in written English.
It can be used when describing a collection that primarily consists of certain elements or types of content.
Example: "The book is a compilation of mostly short stories from various authors."
Alternatives: "a collection of mainly" or "an assortment of primarily".
A compilation of documents, mostly by students, on African authors (including some biographical information), African literary themes, bibliographies, and discussions of postcolonial literary theory arranged on a Web site.
This document consists of a compilation of clippings mostly of a scandalous or scurrilous kind reflecting his interest in gossip, scandalous divorces, demi-mondaine girls (some revealing their arms and ankles) and spicy tales from the 'pink-un'." Our introduction to Hambleton Hall was discovered through the kind generosity of Ellen Easton and her blog, Tea Travels.
About a year ago, Strachwitz released "Hear Me Howling," a compilation of his recordings — mostly blues — featuring musicians such as Jesse Fuller, Lightnin' Hopkins, Big Mama Thornton, Clifton Chenier, and Reverend Gary Davis.
Not literary but religious-magical in its purposes, it is mostly a compilation of hymns, dedicated to a number of gods of the Vedic religion.
His most recent book, "Tiananmen Massacre," is mostly a compilation of previously published accounts from various sources of the government crackdown of June 4 , 1989
Officials in Brussels predict it will mostly be a compilation of existing British positions - "a best of" is how one described it.
Barry Weber of Allmusic, on the other hand, criticized the album for failing to engage contemporary musical trends and said it "sounds sloppy and mostly like a compilation of old B-sides".
The report, which was mostly based on a compilation of existing research, states that edible food is wasted — or "lost" — in the country at many different levels of food production, distribution and consumption.
The book is a compilation of cartoons from the hugely popular humor site TheOatmeal.com, poking fun at mostly easy targets like Apple cultists, cats and Canadians.
The immediate proposals on the owners' table, a compilation of ideas presented by the commissioner's office and general managers, are mostly designed to aid low-revenue clubs in their attempt to keep up with their wealthier brethren.
