If you're the sort of Web surfer who hangs out on social-networking sites like MySpace and Facebook or someone who frequents MP3 blogs, you've surely seen and used one of the free Flash audio players in this article. All of the Web-based apps below let you add a functional music player to your home page or blog with no muss and very little fuss.
In this article, I am focusing on Web software that lets you create custom playlists with specific songs that you want to include. I also include Last.fm (the half in my count) because I love it, but its embeddable player works by offering a personal radio station based on your musical preferences. The music is fantastic, but you can't pick specific songs to add to your playlist.
1, imeem

Publisher's description of imeem
From imeem:
imeem is an online community where artists, fans & friends can promote their content, share their tastes, and discover new blogs, photos, music and video. Users can create audio, video, and photo playlists from their own content or their favorite selections on the imeem network.
2, MyFlashFetish

Publisher's description of MyFlashFetish
From MyFlashFetish.com:
MyFlashFetish is a Web site that lets users create music players, slideshows, widgets, Web templates, and other tools for publishing content on Web pages or social networking sites like MySpace.
3, FineTune

Publisher's description of FineTune
From FineTune:
FineTune is new kind of online music service with a unique combination of features: Enter an artist name, listen to a playlist of related artists personalized for you, create your own playlist from our library, listen, and share with others. Add your playlist to your blog or MySpace page, explore the finetune community browse, listen, create a profile, tag, and connect with other users.
4, Project Playlist

Publisher's description of Project Playlist
From Project Playlist, Inc.:
Project Playlist is an information location tool devoted entirely to the world of music. Our purpose is to help you find and enjoy music legally throughout the Web in the same way that other search engines help you find Web pages, images, and other media, but we also add a social/community twist. We make it easy for you to create playlists, share your playlists with friends, and browse playlists of others.
5, SeeqPod

Publisher's description of SeeqPod
From SeeqPod:
Currently in beta, SeeqPod's first consumer site empowers users by allowing them to search and discover music and video all over the Web. Our intelligent software robots work with targeted crawling systems to auto-submit content to the site. This, combined with user submissions, results in a large and rich search and discovery index. This process can be viewed in real-time via the PodCrawler.
Born out of UC's Lawrence Berkeley National Laboratory (LBNL), 'Playable Search' is made possible through biomimetic search & discovery technology, a method that mimics the way the human mind might use context to make and recall associations, an approach which relies on context by finding the hidden relationships in digital content and data.
SeeqPod has provided public access to its technologies through SeeqPod Media Search, Recommendation and Discovery Services (SMSRDS), a REST-based API. SMSRDS enables third-party developers to easily integrate SeeqPod technologies into social networks, ad networks, and other consumer applications, and improve their user's experience in new and novel ways."
6, SplashCast

Publisher's description of SplashCast
From SplashCast:
The SplashCast service enables anyone to create streaming media channels that mix together video, music, photos, narration, text, as well as RSS feeds, PowerPoint presentations and PDF documents. These user-generated channels can be played and easily syndicated on any Web site, blog, or social network page. When channel owners modify their channel, their content is automatically updated across all the Web pages tuned to that channel.
7, Streampad

Publisher's description of Streampad
From Streampad:
Streampad is an Internet audio player. You can listen to your own music from anywhere in the world, stream concerts from the Internet Archive, tune in to great music from around the web, create your own playlists and share them on your own site, and see what your friends are listening to.
8, Hypster

Publisher's description of Hypster
From Burned Media Ltd.:
Hypster is a music playlist and discovery site. Sign up, upload your tracks, and share your playlist with others on our site or social sites like MySpace. You can also check out our daily updated music news and artist profile sections. Bands/Artists can upgrade to find new fans and promote their music.
9, Last.fm

Publisher's description of Last.fm
From Last.fm:
Last.fm radio learns what music you like and gets better with recommendations the more you use it. Discover new artists, find out when their gigs are, and invite friends. We've also got free music. Create a profile to share your musical tastes with friends or listen to personalised radio.