Posts Tagged songs

Some like it loud …

One of the nifty features that we’ve rolled out in the last 6 months here at the Echo Nest is an extremely flexible  song search API.  With this API you can search for songs based upon all sorts of criteria from tempo, key mode, duration.  You can use this API to do things that would be really hard to do.  For example, here’s a bit of python that will show you the loudest songs for an artist:

from pyechonest import song as songAPI
from pyechonest import artist as artistAPI

def find_loudest_songs(artist_name):
    artists =, results=1)
    if artists:
        songs =[0].id, sort='loudness-desc')
        for song in songs:
            print song.get_audio_summary().loudness, song.title

Here  are the loudest songs for some  sample artists:

  • The Beatles: Helter Skelter, Sgt Peppers Lonely Hearts Club Band
  • Metallica: Cyanide, All Nightmare Long
  • The White Stripes: Broken Bricks, Fell in love with a girl
  • Led Zeppelin: Rock and Roll, Black Dog

We can easily  change the code to help us find the softest songs for an artist, or the fastest, or the shortest.   Some more examples:

  • Shortest Beatles song: Her Majesty at 23.2 second
  • Longest Beatles song:  Revolution #9 at 8:35
  • Slowest Beatles song: Julia at 57 BPMs
  • Softest Beatles song: Julia at -27DB BPMs (Blackbird is at -25DB)

I think it is interesting to find the outliers. For instance, here’s the softest song by Muse (which is usually a very loud artist):

Bedroom Acoustics by Muse

We can combine these attributes too so we can find the fastest loud Beatles song (I feel fine, at -7.5 DB and 180 BPM, or the slowest loud Beatles song (Don’t let me down, at -6.6 DB and 65 BPM).

The search songs api is a good example of the power of the Echo Nest platform. We have data on millions of songs that you can use to answer questions about music that have traditionally been very hard to answer.

Leave a comment

The Echo Nest Song API

This weekend at the Amsterdam Music Hack day we are releasing lots of new stuff. First of all, we opening up beta access to the next version of our APIs.  This version is an all new architecture – that I’m rather excited about. Some new features:
  • Performance – api method calls run faster – on average API methods are running 3X faster than the older version.
  • JSON Output – all of our methods now support JSON output in addition to XML.  This greatly simplifies writing client libraries for the Echo Nest
  • Nimble coding – with the new architecture it will be much easier for us to roll out new features – so expect to see new features added to the Echo Nest platform every month
  • No cruft – we are revisiting our APIs to try to eliminate inconsistencies, redundancies and unnecessary features to make them as clean as we can.

The beta version of our next generation APIs are here:

The first significant new API we are adding is the Song API – this gives you all sorts of ways to search for and retrieve song level data.  With the song API you can do the following:

  • search for songs via  artist name, song title, and description. You can affect the results with constraints and sorts:
    • constrain the results by a number of factors including musical attributes like tempo, loudness, time signature and key, artist hotttnesss, location
    • sort – the results by any of the attributes
  • Find similar songs – find similar songs to  a seed song
  • Find profile – get all sorts of info about a song including audio, audio summary info, track data for different catalogs, song hottttnesss, artist_hotttnesss, artist_location, and detailed track analysis
  • Identify songs – works in conjunction with the ENMFP

There are lots of things you can do with this API. Here’s just a quick sample of the types of queries you can make:

Find the loudest thrash songs


Find indie songs for jogging


Fetch the tempo of Hey Jude


Fetch the track audio and analysis of Bad Romance


Find songs similar to Bad Romance


We have two clients that support the new beta version of the API:
  • jen-api – a java client
  • beta_pyechonest – a new branch of the venerable pyechonest library. Grab it from SVN with
svn checkout beta-pyechonest-read-only

I’ll be writing more about all of the new APIs real soon.   Access the beta Echo Nest APIs here:

, , ,