No. In principle, you can not just use my songs in your projects without permission or license. However, some clarification is needed — please read all bullets to get the full understanding.
For the following points, it is important to distinguish between my cover music and my original music. I don’t own the full copyright for my cover songs, so you should consider these as belonging to someone else. I can not grant you full permission to use these. However, as described below you may still be able to use my covers for YouTube uploads.
When uploading videos to YouTube, there’s an automatic system (called Content ID) that automatically detects all music used in the videos uploaded and royalties are paid to the copyright owner. This means, that you can safely use both my cover music and my original music for YouTube uploads. Just be aware that the copyright owner has control over your video, and can take it down. However, that rarely happens — and regarding my own music, then I will not take your videos down.
If you want to use my original music for other projects than YouTube uploads, then licenses can be requested here — CD Baby Licensing. If what you’re looking for is not on the list, then send me an e‑mail and we’ll figure it out.
If you want to legally use my cover music for other projects than YouTube uploads, then you need to purchase a license from the original copyright holder. Unfortunately, I cannot advise you further on this topic.