Render tune title, subtitle and composer in Latex/HTML and not in the image. This way the titles remains a constant size even if the image needs to be scaled. And we have that text appearance under our control. I can't find a way of switching off the tune title in abcm2ps, and have worked around by setting the title format to Y0. Y is not a defined ABC header and is not found in any Dottes tune.

<div class="dottes-tune-list-item">
  <div class="dottes-tune-list-item-link">
    <a class="dottes-tune-link" href="@TUNE@.html">@TITLE@</a>
  </div>
  <div class="dottes-tune-list-item-image">
    <img class="dottes-tune-table-image" src="firstline-@TUNE@.png"
         alt="@TITLE@ first line">
  </div>
</div>