The free and open source alternative is Echo Nest / Echo Print. They claim to have a database of 30 million songs and 1.5 million artists, and they provide free access for both commercial and non-commercial use. Probably worth checking out!
ACRCloud supports Music/Audio search engine and SDK for iOS/Android/Linux, which could be downloaded after registration (http://console.acrcloud.com/signup). There are three tiers:
Audio recognition services are provided by a number of companies, many of which license these services for a fee. None are cheap, requiring significant repositories of signatures / music catalogs and computational capacity. Check out the folks who own the technology used by Shazam - Landmark Digital Services, the makers of Soundhound - Midomi, or Gracenote's MusicID. There are others, but these are probably three of the biggest players currently.
UPDATE (11/8/12): To note, Shazam apparently has reacquired the rights to the recognition technology and Landmark Digital is now defunct. Also, as noted in another answer, Echonest now provides a recognition technology, Echoprint, that for some uses appears to be free.
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免费开源替代方案是 Echo Nest / 回显打印。他们声称拥有一个包含 3000 万首歌曲和 150 万艺术家的数据库，并且提供商业和非商业用途的免费访问。也许值得一看！
更新：这是 Echo Nest iOS 库
The free and open source alternative is Echo Nest / Echo Print. They claim to have a database of 30 million songs and 1.5 million artists, and they provide free access for both commercial and non-commercial use. Probably worth checking out!
Update: here's the Echo Nest iOS library
ACRCloud支持音乐/音频搜索引擎和iOS/Android/Linux SDK，注册后即可下载(http://console.acrcloud.com/signup）。
共有三个层：
ACRCloud supports Music/Audio search engine and SDK for iOS/Android/Linux, which could be downloaded after registration (http://console.acrcloud.com/signup).
There are three tiers:
音频识别服务由许多公司提供，其中许多公司收取这些服务的费用。没有一个是便宜的，需要大量的签名/音乐目录存储库和计算能力。了解 Shazam 使用的技术的拥有者 - Landmark Digital Services，Soundhound 的制造商 - Midomi，或 Gracenote音乐ID。还有其他人，但这可能是目前最大的三个参与者。
更新（2012 年 11 月 8 日）： 值得注意的是，Shazam 显然已重新获得了识别技术和 Landmark Digital 现已失效。另外，正如另一个答案中所述，Echonest 现在提供了一种识别技术，Echoprint，对于某些用途来说似乎是免费的。
Audio recognition services are provided by a number of companies, many of which license these services for a fee. None are cheap, requiring significant repositories of signatures / music catalogs and computational capacity. Check out the folks who own the technology used by Shazam - Landmark Digital Services, the makers of Soundhound - Midomi, or Gracenote's MusicID. There are others, but these are probably three of the biggest players currently.
UPDATE (11/8/12): To note, Shazam apparently has reacquired the rights to the recognition technology and Landmark Digital is now defunct. Also, as noted in another answer, Echonest now provides a recognition technology, Echoprint, that for some uses appears to be free.