If you want to enable Europeana to use your audio material as part of thematic collections and make it more accessible on the Europeana website then the audio needs to be embeddable (any oEmbed compliant player is supported by Europeana), or you need to provide at least a direct link to an audio file in a format that can be played directly by modern browsers and supported in HTML5. The quality of the audio file should be as high as possible; in other words, as close as possible to the digital source file encoded in a lossless file format. Audio files that meet these requirements will be accessible directly on the thematic collection pages as embedded audio files.
Content Tier 3 (Europeana as a distribution platform for non-commercial reuse)
If you want to make use of Europeana as a distribution platform that enables the use of your audio files by private individuals, educators and researchers then, in addition to the criteria described for Tier 2 above, you also need to make sure that the audio file comes with one of the seven rights statements that allow reuse:
4 Creative Commons licences: CC BY-NC, CC BY-ND, CC BY-NC-SA, CC BY-NC-ND
Content Tier 4 (Europeana as a free reuse platform)
If you want to make use of Europeana as a platform that enables the free reuse of your audio files elsewhere then, in addition to the criteria described for Tiers 2 and 3 above, you also need to make sure that the audio file comes with a rights statement that allows free reuse (CC BY, CC BY-SA, CC0 or PDM).
Overview of Content tier 2-4 requirements for audio files
A direct link to a sound resource* is available OR embeddable media as edm:isShownBy**
For display purposes the edm:object value can be used to represent an illustrative image for the audio type records. Example here and here.
*A sound resource is available=true if one of the edm:WebResource associated via edm:isShownBy or edm:hasView exists AND technical metadata (ie. ebucore:hasMimetype filled) is extracted from that media resource
**Embeddable media as edm:isShownBy - list of URLs validated for embedding
The * wildcard means that it can match any text within that section of the URL. Also note that anything after the end of the URL pattern is acceptable.