Here are some places to find legal music, speech & sound effects.

Music to Download

• https://www.youtube.com/channel/UCQsBfyc5eOobgCzeY8bBzFg Youtube offers lot’s of music to use. Some requires attribution, others not. Check each piece for requirements.
• https://artlist.io/ Search for music by genre and musical style. Various usage.
• Jamendo.com has lot’s of different genres of available music
• JSayles Beautiful Medeaval & Renaissance Music

Sound Effects

• Sound Bible :: soundbible.com
• Flashkit :: http://www.flashkit.com This is rather ANCIENT in web terms, but it’s still there!
• Find Sounds :: http://www.findsounds.com

Text to Speech

• Text to Speech, from AT&T
• …or from Read the Words

Photos, Videos, Audio & Misc

• Creative Commons presents cultural, scientific and other works released as CC.  In most cases you have to attribute credit to the artist that created the work, but the requirements vary.
• Archive.org has public domain or creative commons licensed music, images, video, live recordings, texts. Everything on the site has the specification for how it can be used and which type of license it has.
• The Library of Congress, especially the digital collection has wonderful historic photos, maps and recordings that “we the people” own.