First commit. MPD connects.

Gemfile

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+source 'https://rubygems.org'
+
+gem 'sinatra'
+gem 'foreman'
+
+gem 'ruby-mpd'
+
+group :development do
+  gem 'shotgun'
+end
+
+group :production do
+  gem 'thin'
+end

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    daemons (1.1.9)
+    dotenv (0.8.0)
+    eventmachine (1.0.3)
+    foreman (0.63.0)
+      dotenv (>= 0.7)
+      thor (>= 0.13.6)
+    rack (1.5.2)
+    rack-protection (1.5.0)
+      rack
+    ruby-mpd (0.2.4)
+    shotgun (0.9)
+      rack (>= 1.0)
+    sinatra (1.4.3)
+      rack (~> 1.4)
+      rack-protection (~> 1.4)
+      tilt (~> 1.3, >= 1.3.4)
+    thin (1.5.1)
+      daemons (>= 1.0.9)
+      eventmachine (>= 0.12.6)
+      rack (>= 1.0.0)
+    thor (0.18.1)
+    tilt (1.4.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  foreman
+  ruby-mpd
+  shotgun
+  sinatra
+  thin

config.ru

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+require 'bundler'
+
+Bundler.setup
+require './mpd_client'
+
+run MPDClient

mpd_client.rb

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+require 'sinatra'
+require 'json'
+require 'ruby-mpd'
+
+class MPDClient < Sinatra::Base
+  before do
+    @mpd = MPD.new
+    @mpd.connect
+  end
+
+  get '/api/albums' do
+    @mpd.albums
+  end
+end