130 - Main Entry - Uniform Title

"When a work has appeared under more than one title, a uniform or conventional title may be used for cataloging purposes in order to bring all editions of the work together. Uniform titles have traditionally been used for sacred scriptures, creeds, liturgical works, and anonymous classics. Bible is a very common example of a uniform title in library catalogs; similarly, editions of the Mother Goose verses are assembled under the uniform title Mother Goose."
-- Bohdan S. Wynar Introduction to Cataloging and Classification (8th ed.) by Arlene Taylor, p. 277

When the main entry for a work is a uniform title, rather than a name, it will be in the 130 tag. There are lots of subfields defined in the 130 tag, many relating to musical works. Here are the basic ones you may come across: 

• The title itself, "Arabian nights" for example, is in subfield a.
• If the work described is a treaty, "The Treaty of Utrecht" for example, the date the treaty was signed (1713 in this case) will be in subfield d. 
• If the heading is for a specific part of the work referred to by the uniform title the name of that part will be in subfield p. ( ǂa Bible. ǂp Proverbs.)

The first indicator is a non-filing character (how many characters to skip when sorting) and the second indicator is undefined in the 130 tag. 

You may also find uniform titles serving functions other than as a main entry in which case they will be in a MARC tag suitable to their function in the record.

240 - If another access point (like an author's name) is the main entry, the uniform title goes here.

630 - Used when the uniform title is the subject of the work being described.

730 - When the uniform title is an additional entry, but not the main entry, it goes here. Typically this would be in a situation where there is another main entry, but the uniform title is related, such as a record for an adaptation of the work referred to by the uniform title. The subfield i (which appears first in this tag) describes the relationship of the uniform title to the work represented by the record.