Tango.info performance date

Overview

The tango.info performance date is given in ISO 8601 format in various precision, the most precise the day. For each performance with a single source, or with agreeing sources, the date given in this, or these sources has been used. For contradicting sources one has been picked.

Multiple performances in one recording

In case multiple performances were mixed, it is the day the mixing took place.

If a recording is altered without mixing in other performances (or adding audio ? what is adding?) then the recording date stays, despite under the ISRC rules a new recording was created.

Harmonization

The sources sometimes contradict each other, and dates have been harmonized across tracks that are believed to be made from the same performance.

Work in progress

The dates are work in progress. Some track meta data sources give matrix numbers, which could be used to check whether the order of tracks is the same if sorted by these as if sorted by date.

Sources

• Photographs or scans of paper where recording/performance dates had been written down by the record company, e.g. The Argentine Talking Machine Works - Buenos Aires
• 78 rpm labels contain the year, e.g. T.K. from 1955: https://tango.info/?q=s-54
• Performers emailed dates of their own performances, e.g. Quinteto Angel, Ensemble Hyperion
• CD covers
  • CD issued by record company or under their label (e.g. some Reliquias CDs marked as EMI, contain dates for Odeon recordings - Odeon is owned by EMI
  • CD issued by third party, made from 78 rpm transfers, e.g. Euro Records/BATC, CTA
• Discographies (e.g. todotango.com, tangoteca, Francisco Canaro discography by Christoph Lanner)

Format

The expanded format, i.e. including "-" is used. Range limits are concatenated using "--".

Precision

The format can be,

• any of the ISO 8601 conform formats:
  • YYYY, a year e.g. 1932
  • YYYY-MM, a month in a year, e.g. 1951-11
  • YYYY-MM-DD, a specific date, e.g. 1931-07-01
  • YYYY--YYYY, a range spanning at least from one year to another and including no specific month information, e.g. a) 1933--1934, b) 1933--1956

Historical format and precision

• one non ISO 8601 conform format:
  • YYYY|YYYY, two possible years combined with a "|" character symbolizing an "OR". To be used when there are three or more candidate years known from discographies and some could be excluded leaving only two years, and when these two years notated as a range YYYY--YYYY would include at least one year from a discography that could be excluded. E.g. 1959|1963.

Retrieval

tango.info tagger format string allows retrieving date information.