OCR could be very exciting...I'll be interested to see how that works. That said, I'm not quite sure what the value-add would be. Full-text search isn't super-handy. Searching by musical phrase would be nice, but very hard to make user-friendly. If it automatically parsed out the title and composer that'd also be cool (especially when I upload a 64-tune collection), but from a ML perspective that's not entirely easy.

I wish the website remembered my login.

For my taste the upload form is too cutesy. The faux iPad is a bit much (and makes the site seem very tablet-centric, when in fact it works fine in any browser), there's a lot of real estate devoted to each file and yet somehow they look cluttered, showing PDF in huge letters isn't really necessary when the file extension is shown (and the hover effect makes it seem clickable when it's not), and most importantly there's no obvious way to exit the form—it was a leap of faith to just go to a new page and assume everything had been uploaded correctly. Also, "Remove file" doesn't seem to work—files removed from the upload form (that had already been uploaded) still show up in my library. And then there's no way to delete them from the Web UI.

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I realize I have a specific use case, but the ideal for me would be to snap a picture of a tune I have in a music book, have your OCR magic autofill the title and composer, and let me slap some tags on it. Once that happens I'll become an active user up until I have a personal crisis regarding whether I want to pay $9/month for that or not. But as it stands right now, it really does just feel like an unpolished version of Dropbox