Reasons for keeping different versions of a performance
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The page lists some characteristics of tango music files that can be shared between different files and notes which characteristics are the same for a given performance.
It is assumed that one file contains only one performance.
Characteristics
| tango music file characteristics | Must be equal in a file for a given performance | Effect on audience | Notes | used for |
|---|---|---|---|---|
| bits | no | no | can be easily checked with general file management software, or approximately with hash calculation | used for backup |
| meta data | no | no | ||
| wave form | no | yes | same wave form can be represented by diff. bits | |
| underlying composition | yes | yes | ||
| underlying arrangement | yes | yes | ||
| underlying lyrics | yes | yes | ||
| underlying performer(s) | yes | yes | ||
| playback speed | no | yes | 78rpm effectively run at different speeds, depending on frequency 50Hz vs 60Hz | |
| duration of file | no | yes | either playback speed or length completeness differs, for the latter see full length of the performance | |
| duration of non-silence content | no | yes | ||
| full length of the performance | no | yes | For Noches de amor by Canaro, there is an often published version without the intro | |
| noise | no | yes | ||
| artifacts from lossy compression | no | yes | some people still use lossy compression, while FLAC and other lossless compression is available. |
DJing
Leading and trailing silence can be added to files by software. The pause effect is also influenced by the decision when to start playing a file.