Audio post format
If your post contains audio, then you should use this post format. Select Audio in the appeared metabox and add link to your mp3 file.
Quote post format
Welcome to our wonderful world. We sincerely hope that each and every user entering our website will find exactly what he/she is looking for. Our blog and social media accounts are available to encourage communication and connection between clients and personnel and tell you more about us in the informal environments where we can have a dialogue instead of just a narrative like that.
Image post format
This format perfectly fits in case you need only a single image for your post display. Use Featured image option to add image to the post.