To "live DJ" there's the extremely famous https://virtualdj.com/ To create prerecorded DJ sets https://www.mixmeister.com/ Been using both for at least 10 years, love them both. - Source: Hacker News / 6 months ago

Not open source, but free for "home use" https://virtualdj.com/. - Source: Hacker News / 6 months ago

I started with Virtual DJ to get used to the software latency (I came from turntables) and get my muscle memory on button locations (which is why I stayed with the same brand). VDJ has every feature you need. The software is free to use without a controller from virtualdj.com. Source: almost 2 years ago

A lot of the places that do it from scratch I notice use https://virtualdj.com/. Source: almost 2 years ago

DJ software, like VirtualDJ will have features that are more conducive to what you're trying to do, like live looping functions that help you lock the loop to the beat. It's also cheaper (free for non-commercial use without a hardware controller) than QLab, and it's cross-platform (QLab is Mac-only, if that matters). Source: about 2 years ago

When you're ready to upgrade, Finale full version has fully sampled sound for hundreds of instruments. Retail $299. finalemusic.com. Source: 7 months ago

Since Sibelius and Finale are two industry-leading (and very much competing) music notation software systems, this headline made me do a quadruple-take! https://www.avid.com/sibelius https://finalemusic.com For those interested in (extremely entertaining) breakdowns of the Sibelius software and other offerings in this space from a UI/UX design perspective, I highly recommend Tantacrul's videos, which propelled him... - Source: Hacker News / over 2 years ago

I too would want the sheet music so I can transcribe it on music notation software like Finale. Source: almost 3 years ago