Jekyll Spotify 
This Jekyll pluging provides a tag that takes Spotify URI and generates a html snippet to embed player your site.
Installation
Add gemfile
gem 'jekyll-spotify'
Execute
bundle
Alternative install the gem
gem install jekyll-spotify
and put this _config.yml
gems: [jekyll-spotify]
Usage
{% spotify spotify:track:3fuNydG9kg2Y09i8Foqq0p %}
or
{% spotify spotify:track:3fuNydG9kg2Y09i8Foqq0p 200 300 %}
Result
output the following code include page
<iframe src="https://embed.spotify.com/?uri=spotify%3Atrack%3A3fuNydG9kg2Y09i8Foqq0p" width="100%" height="300" frameborder="0" allowtransparency="true"></iframe>