By the LP era, in some cases (notably the least expensive of the records) the record album would have only one cover version of a famous song or tune. Many of these albums had attractive album cover artwork (often picturing beautiful starlets such as Jayne Mansfield, Kim Novak, Irish McCalla, and the then-unknown Mary Tyler Moore). The album were often filled out with music in the public domain or obscure music never recorded by anyone else. Sometimes the "orchestras" comprised very few musicians, were performed by background music companies, or were recorded outside the United States by orchestras credited under different names, such as "101 Strings".