Re: the missing submit, etc. button on the Collection page - I've tried to simplify the form and keep the page design as clean as possible. But I can see where a submit button on the page would be more immediately obvious and intuitive. Appreciate the feedback, and I'll consider it. Worth noting that Google Chrome and MS Office, etc. take a similar design approach though - and try to avoid too much redundancy in menu options, etc. This admittedly comes at the expense of programs being harder to learn the first time, but once you are familiar - it can be better/cleaner, etc. in the long run with screens that are less cluttered, etc. Definitely a trade off though.
Please note that for a button to click - without having to use Ctrl + S, or File > Save, if you click the disk/Save icon which is always visible at the top left (similar to MS Word, and other programs) and this will have the save effect as a 'submit' button, if added, with the added benefit that it (the existing 'Save' button) works for Songs as well as Collections.