Improve cold B2B sales email

We are doing cold B2B emails trying to persuade recipients to trial our website-plugin for music blogs. We currently have 3 personalized emails we send out to leads until we get a response. We would like to improve our existing email copy to inspire a response from the blog owners as well as build add a 4th email to our reach-out process. Please advise if you can see possibility for improvements to our emails that would result in a increased response rate and if you would be able to write a 4th email to our reach-out process. Our product is a website plug-in for music blogs called 'Soundninja'. We are currently trying to persuade blog owners big and small to trial our plug-in. I will share more information about the product to the right freelancers. We currently send out up to 3 reach-out emails to prospective clients, each with the goal of getting a response back and starting a conversation. We send out the emails and wait 2-3 days before sending the next email. Our emails are sent by our business development intern, Kaela. Here is email 1: Subject: Just Returning the Favor Hey [prospect], I just discovered [artist] from a post on [blog name] -- awesome find! They're now on my workout playlist for tonight :) I'd like to return the favor. Are you interested in growing your readership or getting more ad revenue from your website? To give back to the music bloggers who've given us so many classic tunes, myself and a team of wizards from Australia built a new website plug-in for music blogs we call 'Soundninja'. Soundninja enhances editorial content to boost reader engagement and creates a new source of advertising revenue for websites that discuss musicians. After installed, the plug-in displays the latest songs and upcoming concerts of the musician's mentioned in your posts, automagically and for free :) I'd love to you talk to you more about how Soundninja can help grow [blog name] and show you a demo, if you're interested. Have you tried advertisements on [blog name] in the past? Best, Kaela Email 2: Subject: Re: Just Returning the Favor Hey [prospect], I just wanted to circle back on my last email RE: [blog name] + Soundninja Growing blogs are weary of using advertising on their site and for good reason -- Doing too many irrelevant ads can damage their credibility and lose loyal readers. But what if ad technology improved reader's experience of your blog instead of detract from it? Our website plug-in enhances your content by displaying upcoming concerts of only the musicians you mention in your posts. Your readers have already demonstrated they are interested in finding great music, why not give them the option to see the artists you write about at a live event? Let's explore how Soundninja can help grow [blog name]'s readership and create a new revenue source. Are the artists you write about on Spotify or only Soundcloud? Best regards, Kaela Email 3: Subject: Re: Re: Just Returning the Favor Hi [name], I'm sure you heard of some of the big things happening in the music tech scene right now. Aside from Apple and Spotify's landgrabs in the streaming game, new startup Distrokid is offering upload all of an artist's music to Spotify, iTunes, Google Play & Amazon Music for only $19.95 -- making it hyper-easy for emerging artists to get their stuff on the big libraries and in front of a larger audience. I think the artists who take advantage of this and other new technologies will be able to grow their audience and careers much easier than those who don't. With Soundninja, we want to be part of this wave and help independent artists convert the media coverage blogs like yours give them into ticket sales. This is a demo of our plug-in running on one our beta program blogs: [login to view URL] Just hover your mouse over any of the artist names to see it action. Q: Cool or nah? A: 1. Cool. 2. Nah. Best, Kaela