ISMIR 2018 has published their recordings of the presentations on their YouTube channel. If you are particularly interested in the OMR talks, here they are:

• B12 – Towards Full-Pipeline Handwritten OMR with Musical Symbol Detection by U-Nets
• B13 – Searching Page-Images of Early Music Scanned with OMR: A Scalable Solution With Minimal Absent Words
• B14 – Optical Music Recognition in Mensural Notation with Region-based Convolutional Neural Networks
• B15 – Camera-PrIMus: Neural End-to-End Optical Music Recognition on Realistic Monophonic Scores
• B16 Document Analysis of Music Score Images with Selectional Auto-Encoders
• B18 Deep Watershed Detector for Music Object Recognition

Similarly, if you could not attend the DLfM 2018, here are the recordings of the OMR-related talks given there:

• Jan Hajic – How Current Optical Music Recognition Systems Are Becoming Useful for Digital Libraries

• David Rizo – MuRET: A music recognition, encoding, and transcription tool

• Peter Jonas – Scores of Scores: An ‘OpenScore’ project to liberate sheet music and musical file formats