Suppose you want to add a tag value to multiple files at the same time.
That is not a problem if you want all the selected files to have the exact same tag values.
You can use the Tag Editor for that.
But if the files already contain various tag values, and you simply want to add an additional value to all of them while keeping the existing ones intact, it's more difficult.
Let's say for example you have been using the 'keywords' tag, and want to add something like 'Christmas' as a keyword to multiple songs at once.
Without worrying about possibly erasing existing keywords.
Or you want to add 'Ambient' to the 'genre' tag of multiple songs that already have one or more other genres added.
MusicBee doesn't have some straightforward 'add tag value' feature for this.
You can use the Tag Inspector, but it's interface is not ideal for this.
Also the Tag Inspector only allows for bulk editing of tags if the files are all of the same file format.
So if for example you have selected both mp3 and flac files, this won't work.
This is a method that makes it possible to add a tag value to multiple files at once, without deleting existing tag values.
To use it, you need to have the
Additional Tagging & Reporting Tools installed.
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Download the preset here- - -
how to install the preset:- open AT&RT's 'Advanced Search & Replace' panel
- click the 'Import…' button and navigate to the downloaded preset
- click 'Save All & Close'
how to use:- In MusicBee, select the songs or albums that you want to add a tag value to, then:
- Menu > Tools > Additional Tagging Tools > Advanced Search & Replace
- tip: if you intend to use this preset more frequently, check the 'Assign hotkey for this preset' in the ASR panel,
- and then create a keyboard hotkey and/or a toolbar icon for it in MusicBee: 'Tagging Tools: Add a tag value to multiple files'
- Then:
- 1 find and select the preset 'Add a tag value to multiple files'
- DO NOT check the checkbox in front of it!
- MAKE SURE it is not checked!
- 2 Select the tag (<Tag 1>) that you want to add the value to
- 3 Type the value that you want to add in the <Custom text 1> field
- You can add multiple values using '; ' as separator. (e.g.: Ambient; Experimental; IDM)
- 4 Press 'Preview'

Check the preview to make sure you are happy with the results, if so: apply, close.

that's it
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Update:
I have added a preset to the download that can do the opposite: it makes it possible to
remove a specific tag value from multiple files.