At first fixed fields seem abstruse. Soon the more common ones will become second nature. See the bibliographic utility's coding manual or MARC for codes not included here. 037 Record label number. On OCLC keyed like 050 and used for locally assigned LCC numbers.
Many sound recordings are of mixed responsibility and are entered under title.
Sound recordings may be entered under the first composer or performer given, if there are three or less. Audio books are entered under the author of the text being read. If what you have is the recording of conference proceedings, the name of the conference is the author. For the Bible you give language and date. In 245 only the first word and proper names are capitalized.