Whether you access the catalog via API or feed, you are required to track the lyrics usage/views.

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Views tracking for Catalog access via API

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Tracking URLs implementation

When displaying any type of content, you are required to include in your page/application one of the two available tracking system:

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1. JavaScript for websites

Get the URL returned into the field script_tracking_url from the track.lyrics.get api response and include it as script tag. 
<script type="text/javascript" src="http://tracking.musixmatch.com/t1.0/AMa6hJCIEzn1v8RuOP">

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2. Image pixel

Include the URL returned into the field pixel_tracking_url as an image src when it’s not possible to use the script. 
<img src="http://tracking.musixmatch.com/t1.0/AMa6hJCIEzn1v8RuXW">
Furthermore, every time a lyrics is present in a page the lyrics_copyright field must also be clearly visible.

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Views tracking for Catalog Feed access

In case you access the catalog via feed, you’ll need to provide back a usage report on a monthly basis. The lyrics usage report must comply to the technical specifications that will be provided to you once the service terms are agreed on.